Malicious PDF — malware analysis report

Static analysis result for SHA-256 791a7aff23e4fee0…

MALICIOUS

PDF

73.6 KB Created: 2021-01-13 18:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 78c33d60a4bba69541310c6b6dbd5e32 SHA-1: 31bc80360cd7f8522b85ae86e97bf9435b644fdc SHA-256: 791a7aff23e4fee02642bfa5e3512feb4aa451502bda299f9c70ec190678c7c6
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to disposable hosting, and one specific URL, 'https://trafftec.ru/aws?utm_term=biography+audio+books+free', is identified as a potential lure for phishing or malware distribution. The presence of embedded URLs and the nature of the links suggest an attempt to redirect users to malicious content, likely for credential harvesting or further infection.

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 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://trafftec.ru/aws?utm_term=biography+audio+books+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450160/normal_5fa6dcea379bc.pdfIn PDF document text
    • https://vawenajibafadak.weebly.com/uploads/1/3/1/3/131384306/6552334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_5fc3025bc9ff8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5fe48c97b7f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451217/normal_5fc249ed487f3.pdfIn PDF document text
    • https://site-1185743.mozfiles.com/files/1185743/33120015453.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/karexafisexowu-sekim.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/nepakupi-nozav-kikipunure-vazudimuridago.pdfIn PDF document text
    • https://lijoliwaxodoxi.weebly.com/uploads/1/3/1/3/131398144/6fe5c735.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/jivagajamav/nufexabisunawikajexuser.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/stewart_title_estimated_cost_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/aluminium_cladding_sheet_hs_code.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_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 5624 bytes
SHA-256: 37fa275d1e1a035aa33b2e299ced0a30bfad3b90059a03c5c1ee3f606faf6dfa
font_01_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 10988 bytes
SHA-256: 5f7e4a482fc1e5e172b4968f8d24077e21355f65e80100f0b5c04998a81ccede

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