Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4df92cc1f12a8e9…

MALICIOUS

PDF

72.9 KB Created: 2020-11-20 03:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bfc05ee1116545f34ba90cd0898bd42c SHA-1: dc6cef4d758b116fa0d6f5a3ec2637802763fb4b SHA-256: b4df92cc1f12a8e9e769275eb2fe6048793ee797a7a445db97ba1a470fe933c0
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 0.9997

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://trafffe.ru/123?utm_term=body+image+activities+for+middle+school+students PDF link annotation
    • https://nafeziwubiwodi.weebly.com/uploads/1/3/1/3/131379183/669776.pdfIn PDF document text
    • https://mogiwojijefinan.weebly.com/uploads/1/3/4/9/134900510/4234902.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/236ae.pdfIn PDF document text
    • https://fuwanitawoge.weebly.com/uploads/1/3/4/4/134436239/1145131.pdfIn PDF document text
    • https://saloramorolo.weebly.com/uploads/1/3/4/3/134307331/5657429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5faf52a8c0266.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/cbfa9220-2470-4be4-93e3-058b529382c1/66004029723.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/95969732720.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/mewej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13e71b0-a1b3-4f19-8f4b-41c4b9f9c104/6341096778.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/iowa_medicaid_amerigroup_provider_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047b891e-13ad-4985-b87d-e81aeff0daaa/pemixidi.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_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 5648 bytes
SHA-256: bd8e143399ac0a740d9bb4c95635b60f71fe83117400861a45dc552cc25e8d6b
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 10072 bytes
SHA-256: 7c907eb473d0cdc201bf7c3da37ae033ccd7681999657d0f969ce36c6e764476

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