Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8994e35a48983a4…

MALICIOUS

PDF

102.0 KB Created: 2020-12-18 13:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 29df2cb85b329f6e9e1092cbfd0d9a5b SHA-1: 2164d928b145f3a6719a9d115a646e4582208481 SHA-256: c8994e35a48983a4fd10765a53bac5cf0dbe67ee602402b90e195b86d47cbe0e
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is a phishing lure and a link farm, designed to redirect users to malicious sites. The presence of a brand impersonation heuristic and numerous external links, including one pointing to a known redirector, strongly suggests a credential phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to download a second-stage payload.

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.
  • 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://pewixuzapama.weebly.com/uploads/1/3/4/6/134655392/9715054.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://traffnew.ru/aws?utm_term=endospore+formation+pathway PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f870a3a90860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_5fb6ab900a232.pdfIn PDF document text
    • https://pewixuzapama.weebly.com/uploads/1/3/4/6/134655392/9715054.pdfIn PDF document text
    • https://lewugudufe.weebly.com/uploads/1/3/4/6/134668986/vuwobalagimiloki.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/0191efe7-c8cb-4548-b024-54c29292daf4/borst_detasseling_iowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb31d9fc-8c17-4e84-a914-4f354824432d/distance_between_hurdles_in_100_metr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcdc3c60-4546-476d-82e5-4653ff288d1e/votuxojibefuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3503d4-1b2b-4909-9185-e22616bf332f/3649518274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab8b862-b168-4398-9303-b15b783e05a2/vozez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02f0f99-0565-4993-a9c4-3f27afe3dc9d/somewhere_in_time_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e52648ba-10a4-4ad8-aa41-d85d6d5d73ef/usos_y_aplicaciones_de_los_eteres.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/58616694167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25828130-db5e-426e-b77f-e7423494b1bd/46047312731.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_off000151a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A4 5400 bytes
SHA-256: 4b8f70eeb0acec476b643af821b8d102ca7e56023d0cbcb57203f06b1cea897b
font_01_sfnt_off000163ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EF 11548 bytes
SHA-256: 4ac8ed42f1d2d1730fdddcb1a7f91afff87ba63b6b2b3ffa4406e2205bea89ab

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