Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ed2355e29c03f7…

MALICIOUS

PDF

101.0 KB Created: 2021-01-16 15:36:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 91cf50be929fc3b4d9600a481e1a7f7d SHA-1: 76149bf07388a4c760ba658014e94eef4e1c20f4 SHA-256: d8ed2355e29c03f75a7e24aceb78d1057ed064793d8f790a03d4e725fcb40223
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://traffnew.ru/123?utm_term=google+sites+66+slope', are likely used to redirect users to malicious sites. No scripts were extracted from this sample, but the overall structure and URL distribution strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffnew.ru/123?utm_term=google+sites+66+slope PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451039/normal_5fc088b66ce08.pdfIn PDF document text
    • https://jewumuseporefi.weebly.com/uploads/1/3/4/5/134599703/1525507.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/wafubaduxave-kataweko.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/equalizer_audio_pc_windows_10.pdfIn PDF document text
    • https://pilorixo.weebly.com/uploads/1/3/4/6/134689004/3491256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_5fd9da5aee248.pdfIn PDF document text
    • https://zikawudewodag.weebly.com/uploads/1/3/4/5/134585044/xigedalonoka.pdfIn PDF document text
    • https://site-1173293.mozfiles.com/files/1173293/suvanikerobis.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/lerarifonuzeru.pdfIn PDF document text
    • https://wubiwadodeta.weebly.com/uploads/1/3/4/5/134577579/kawofobob.pdfIn PDF document text
    • https://site-1167961.mozfiles.com/files/1167961/13302662194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00014f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2D 4864 bytes
SHA-256: a9ab20f5b4801f30b1a0671b285da0bc03cc214b5d52fa39f16d32855dbfa8e4
font_01_sfnt_off00015fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDB 11840 bytes
SHA-256: 57534c79c28dd9798d92c0153eddd249970432524c8fa43f54e985ef3e031bb2

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