Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca08091ac670d402…

MALICIOUS

PDF

118.5 KB Created: 2021-03-25 10:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 799ca88daea05582f9fddfa745e2f778 SHA-1: ebf9b32f68a53cccbd26d01fde5963fa73769177 SHA-256: ca08091ac670d402468fb6cc946e691469b39d1ea910f8335a76e55900c0bf25
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable hosting or unknown domains, indicating a link farm designed for SEO manipulation or malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/wix?keyword=ricoh+aficio+mp+c2051+manual PDF link annotation
    • http://pasendapp.online/walt_disney_world_tickets_october_2021ckdmv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450434/normal_604b34c394c89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fc6cc043626c.pdfIn PDF document text
    • http://optarfes.com/advertising_vs_marketing_master_s_degreeyvlhg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379968/normal_5fcb9d6abf548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409619/normal_6058e02bc629e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457561/normal_6033fcddd0379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/476071e7-22c2-4720-978d-50b6866c85ba/chicco_bravo_for_2_stroller_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d973e6a-9ad5-4a07-9eef-caa825a85782/total_gym_1100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04bc8cf5-97bc-4fad-96ba-a799d72284bc/calories_in_dunkin_donuts_chocolate_iced_donut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f912959-c513-44e8-9874-47697ea69b09/verizon_fios_router_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df0eff2-4f94-4248-a691-e1686d425a6c/60288416998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad224d7-32ee-47e0-b47b-7540434b0c5c/nilosagusokavano.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_de0f17195f554cc1a97e42c1916e8dec.pdf?index=trueIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_06bdca6382aa4f79a59b4dea4dfd87a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d42b29d-c275-4244-895d-fa71eba543be/sample_5_paragraph_essay_middle_school.pdfIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_035cb81508a3477783f667b86867225d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7665e11-e9e8-446c-8904-49a138676123/mark_batterson_quotes_from_the_circle_maker.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_e409710199e9405280e73418b6f73e7d.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_10e25e370d5447bd8a9dfdea5d0d36aa.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_6b523913607c45c08ddb0e0ab7bb25bb.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_0bb4d11f0ead4f1a974edc44c3a0b539.pdf?index=trueIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_026a4d55ada949f0b628a1ffa8b4ec01.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_53ba7b54c3124e5bbb422ce2653f0e02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e4e3b9-a683-47f7-af78-c66ad67bbbe1/korean_from_zero_2_online.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000181d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181D6 5124 bytes
SHA-256: 83f585d317e2e8d7902304199b873f99a0ddd0c58fb3b0aab1ab03a8da6ff430
font_01_sfnt_off00019322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19322 12812 bytes
SHA-256: 707fcef9773d167a8a6d9c7873cf4d47f5bf4793b51d8be973d6c1b8ce057d80
font_02_sfnt_off0001bdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDF7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378