Malicious PDF — malware analysis report

Static analysis result for SHA-256 32551b38bf809708…

MALICIOUS

PDF

85.7 KB Created: 2021-02-17 04:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4cefcd6f376c2e6e4781f67ab03a6c7b SHA-1: 6cbe2fc5dff0cb4a1116d14fa0aad413a89d715a SHA-256: 32551b38bf8097081919a7d9e84b36dc5e564d714a2e403e0bef594d421638bf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO spamming tactic. The presence of a malicious ML classification and ClamAV detection further supports malicious intent. The embedded URL and the heuristic for PDF_SEO_LINK_FARM indicate the primary goal is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=washing+machine+cleaners+near+me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427509/normal_5fec1f561baf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5ffc39a435665.pdfIn PDF document text
    • http://taher-tcac.com/olympus_vr_37042v4v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5ffb57c94e63e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487399/normal_6007bcc5ba86d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493550/normal_5ff2790712ba6.pdfIn PDF document text
    • https://nometoxuf.weebly.com/uploads/1/3/4/2/134266561/c6370e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_5fcd79f29f05a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494889/normal_6004b4aec68c3.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/zivijafavije.pdfIn PDF document text
    • https://zedifetizigofup.weebly.com/uploads/1/3/5/3/135393349/3783351.pdfIn PDF document text
    • http://hisgohar.site/ateten_gmlek_roman_tahlilin4nvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_6021642bc8e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_602683f31eb95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390324/normal_60025d97bff60.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/xoguwavosuje/mituz.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/gadakewugawenijezivefor.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/61623373541.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/47967076276.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 5228 bytes
SHA-256: 65d9efc01368efd605187cc9de0be4ddf145110d9df474f9f298ee53baf1dfdd
font_01_sfnt_off00010efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFD 10852 bytes
SHA-256: 7aeda11c253f989d6333f987b66bec4d78ff7abc28425e8b152314d4b541529d
font_02_sfnt_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 16148 bytes
SHA-256: 36f0f7c847a3d257bca3513ae5362ff552e89fccc363f2ec096b83b555007b24

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