Malicious PDF — malware analysis report

Static analysis result for SHA-256 e821131e381333d1…

MALICIOUS

PDF

64.4 KB Created: 2020-12-16 17:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9c267e46e4957050b59e2fe45f8ef400 SHA-1: 7e6082d2b05903bfffbe0e638b701c0ab9082731 SHA-256: e821131e381333d10d0e0a16305a378f9b6b96f2788a788899458daa74ed8dee
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or scam attempt. It contains numerous external links, with one prominent link pointing to 'trafficel.ru'. The document body, though heavily obfuscated, contains a query about an area code, suggesting a lure to a malicious website. The presence of many external PDF links also suggests a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=where+is+area+code+71822 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408593/normal_5f9520ca877cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5f9fbf5479ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_5fab730d4d38d.pdfIn PDF document text
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/mametumiwunujev-padopokume-bataji-nojobusuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_5fd94b8c95bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_5fadbf5a7702a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5fa24d136a91e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474220/normal_5fc0bbfe87d82.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/pibajuwi/descriptive_research_sample_thesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383bffca-f986-4402-8cd5-0687b1ae8a43/59614325167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2cfd438-b21b-4501-bf77-8e3857cfc77f/85653343800.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e155104edf1d7780ac3e/t/5fc23287f81c9a2a0ceb3f09/1606562440059/82835845105.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe19379d7936484056c845/1606293815907/st_205_75r14_8_ply.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0c293fdc31513a11ad99/1606224937993/tufol.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5196816f6d44b07d9ab25/t/5fd1c21e8ba64b78df554595/1607582239229/fasibenewe.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/avatar_halloween_costumes_for_adults.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_off0000c022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC022 5468 bytes
SHA-256: 6d13db3aa1d8d426a81bb8978ef8534d3d4ae5a82e5b2fe4b27db11772023924
font_01_sfnt_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 9876 bytes
SHA-256: 32f6c029e3ee2e2cfeed7891ac5e14c2d1cd13bee2f14a3d1dc92707b3d7f64b

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