Malicious PDF — malware analysis report

Static analysis result for SHA-256 514cc21ce1e85241…

MALICIOUS

PDF

34.4 KB Created: 2020-11-09 15:37:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ef9fb83baa145f3687f5fb75a8164627 SHA-1: 3b4ace5fb8ab1dfd73c2a956d21da8a8c204f855 SHA-256: 514cc21ce1e85241f8089b17d2ea8c0a72f2a4766cc8b494b8ace6103dc3e59c
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for brand-impersonation credential phishing, specifically impersonating Instagram. It also contains a large number of external links, many of which are to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The embedded URLs and the nature of the heuristics indicate a phishing attempt, likely to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rugazodexozapef.weebly.com/uploads/1/3/4/4/134480570/fb8712f941.pdf.
  • 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://trafftec.ru/aws?keyword=directions+cal+poly+to+slo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383295/normal_5f9e0ad83b88d.pdfIn PDF document text
    • https://rugazodexozapef.weebly.com/uploads/1/3/4/4/134480570/fb8712f941.pdfIn PDF document text
    • https://gowubezu.weebly.com/uploads/1/3/4/4/134497845/a5107cab5d12f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_5f8f7582dd7e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_5f9f1d104ff66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5f986e6f2b89c.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/7358755.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/vetamedisoz/milltronics_hydroranger_200_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c1e290-034b-4e75-99cf-bf903fd9884e/neselipek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236fe8f2-e591-45e2-b7ff-0982e9e7747e/anodea_judith_chakra_yoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9334dc48-b754-4683-bc0d-b8a43b83e991/94527945279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43538201-6fd9-4070-bba5-e072bb9964ef/kunifuwurapin.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_off000047cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47CD 5028 bytes
SHA-256: 43962fffc340f73252ef2f8a1249043588017e3d4e9423ff8bc247d4c1cf8928
font_01_sfnt_off00005905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5905 10660 bytes
SHA-256: c869080de08a6f9212c647b8e859a46475f1f6d59adbb930a23ad95debc269bb

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