Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e778bc1fcfdb36…

MALICIOUS

PDF

77.7 KB Created: 2021-03-08 11:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 87cdd562e785b5f925b775d969024010 SHA-1: 9f6894ae21aa07a691f940cad6ce36cec7a39044 SHA-256: c2e778bc1fcfdb36b498e560a4022c68378962b03c90034fa7099215db10abfe
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://dugedepap.ru/123?utm_term=cyclohexane+chair+conformation+newman+projection PDF link annotation
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/9499126.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/guligexopazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_60392280a5fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_602e1fc35d745.pdfIn PDF document text
    • http://good-production11.site/basic_computer_organization_and_design_in_computer_architecturemkgd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484623/normal_5fd83e3cd297e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_603bc141da763.pdfIn PDF document text
    • http://alcozerox.com/what_are_the_moral_attributes_of_godjivpm.pdfIn PDF document text
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/gafemodurapu.pdfIn PDF document text
    • http://creditscorehelp.info/72334671257mpo7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490746/normal_603bfb1286dd6.pdfIn PDF document text
    • https://pokiwaminexaga.weebly.com/uploads/1/3/1/6/131637240/rolus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dobesogum/alberta_education_contact_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81edfed-47e4-4dc4-950d-28f16d726631/whirlpool_quiet_partner_ii_sanitized_light_blinking.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/siesta_key_beach_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f6d0add-319a-44bf-b084-2456bff49b0f/latogederupireverenugir.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/sopepogivusomenoxemuvuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0ab4aa-b7a3-40c4-a482-2f4e2074abaf/86332827749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02a559d-1f35-452a-90f9-0e3c82e72598/free_cdl_license_training_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/dolce_gusto_english_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea150ae-c554-4945-9463-7bd89acf4533/34608936979.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 5320 bytes
SHA-256: d3d0a8599f00be77e3c290d57b5fbf8a63ad9166e4afd06b55bd3b039d2b90a5
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 10940 bytes
SHA-256: 2a28567bcf0eaecac81e5f82a1ee2e72f47b5df05ffd67016e1e8c6728f581f8

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