Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdaf4f833fb6ae7…

MALICIOUS

PDF

75.6 KB Created: 2021-03-31 19:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6912a0eb0c326fa3d76e72960bb5f107 SHA-1: 304748d6421b718d5bde0132115f19bd10993e15 SHA-256: 0bdaf4f833fb6ae73ec4bb9f7e47bc4eb112a65c245bd2cf9a839a6c4ddd7c88
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting services. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, with the embedded URLs being the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://soxebez.ru/123?utm_term=hypothetical+questions+and+answers+in+call+center PDF link annotation
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/judafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_604200f1b8a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_605b96f7df455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_6007a51feb796.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480403/normal_5ffd369956a6a.pdfIn PDF document text
    • https://zezazerin.weebly.com/uploads/1/3/1/8/131856191/razamul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_605a6d3a55eb5.pdfIn PDF document text
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/4882172.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375504/normal_5fcc2391cca0f.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/2083907.pdfIn PDF document text
    • https://zevigutuxokalu.weebly.com/uploads/1/3/4/7/134769804/06279abd46337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_6031eeeba1f67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef8b0c3-2d7b-4404-b308-c7d404936f08/learn_parkour_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/bejeweled_1_pc_game.pdfIn PDF document text
    • https://8cff2b46-3289-4d4c-b6d5-84761b4963bb.filesusr.com/ugd/c91274_ba4deb351fe847059cfe24618d3c1634.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/62508635171.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/administrative_law.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/fyter_fest_grades_bleacher_report.pdfIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_3ab8ee7d06ad4916a6b537dab34c7be8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2b4270-e41d-4138-8bde-e70c4431457e/real_book_jazz_standards_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b91dcf-5234-4f59-be1e-2df8115d7d86/2013_honda_civic_service_due_soon_b1_reset.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_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 5440 bytes
SHA-256: 06fe87a58f85312a789ff27e05c41eca8e4421e2eb35a551abced66a9f2e787e
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 10888 bytes
SHA-256: 1b0489c73463d9e2d0a8fff16c3e34922ad40cc8c5a94394a7802cb3dee3aa93