Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e55c479f8efafb2…

MALICIOUS

PDF

71.4 KB Created: 2021-03-01 18:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 98460a77fbfc95db39769ef14b3cdf77 SHA-1: b4ec1e4f6d845a9d5e9077a22d975e820a86c80f SHA-256: 7e55c479f8efafb216496bea4e4b8c136271b60604fdedb100fc299da8899183
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. Several heuristics indicate this is a non-clustered link farm on disposable hosting, with many links pointing to PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or engage in phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/123?utm_term=how+often+to+replace+oil+in+lawn+mower PDF link annotation
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/869707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_6029c66c9328f.pdfIn PDF document text
    • https://wifadesar.weebly.com/uploads/1/3/5/3/135345928/moges.pdfIn PDF document text
    • http://legionmone.xyz/908765502877v3o2.pdfIn PDF document text
    • https://mogimefiledewe.weebly.com/uploads/1/3/1/8/131857364/salodun-pasuwokafudu.pdfIn PDF document text
    • http://mx50off.pro/sobuxurob3ubqg.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/dixakipaz.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/1d259.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/93b009d4a5.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/dilej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489607/normal_60385a44ebd42.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/2a169bf.pdfIn PDF document text
    • https://jusegopij.weebly.com/uploads/1/3/4/4/134480833/ed73b941ec550.pdfIn PDF document text
    • http://adyga.site/gemezebodpdp9d.pdfIn PDF document text
    • https://wiwokuvivatazu.weebly.com/uploads/1/3/4/6/134629214/gabatebokidum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_602af5941ce3b.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/debiwelof/annual_board_of_directors_meeting_minutes_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/florida_dmv_questions_and_answers_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/fomoxenewe.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_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 5036 bytes
SHA-256: a762ed3d9152ac72fb050242d6a419829f55f34b8d86265fd1bd2e540ac74319
font_01_sfnt_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 10444 bytes
SHA-256: 2e49b53ec07a8507e6825a65397fb14903f077812c67c943a949f688abe6a819

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