Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ce9bb7ebfd5c57…

MALICIOUS

PDF

74.1 KB Created: 2021-02-10 00:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ba6cb924e46cb5764f066a801aeeb3e1 SHA-1: b6e046ffee8c50e2c08b421c9a44784e60989d2e SHA-256: f6ce9bb7ebfd5c57392d5eabeba8cbe365ddd6a7ca5210f241d5ded4332b6fc3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as an external URI pointing to 'https://baarspo.ru/123?utm_term=swimming+motivational+times'. The PDF's structure and the presence of many links suggest it functions as a link farm, likely leading to phishing or malware distribution. No scripts were extracted, but the PDF's nature strongly suggests it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/123?utm_term=swimming+motivational+times PDF link annotation
    • https://cdn.sqhk.co/tumitibira/jZhengd/galaxy_shooter_alien_attack_gift_codes.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/sapuwilupomakubes.pdfIn PDF document text
    • https://padaduzarunum.weebly.com/uploads/1/3/1/1/131164270/2995276.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/juvivop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_5fd375fce3b15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402247/normal_60038e6feb867.pdfIn PDF document text
    • https://jupepirime.weebly.com/uploads/1/3/4/3/134313464/cc3cc6.pdfIn PDF document text
    • http://lebiwejodedexo.22web.org/pumuzepogotafugev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supisaminuwon.rf.gd/wulelafebeputuji.pdfIn PDF document text
    • http://goxojerodumofag.epizy.com/vifibuzigojux.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/management_audit_report_format.pdfIn PDF document text
    • http://xajokaxakubif.rf.gd/topugesuvozow.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/baburao_boltoy_dj_song.pdfIn PDF document text
    • http://runesufosufej.rf.gd/a_state_of_trance_2019_ibiza.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/80312877079.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_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 5164 bytes
SHA-256: aa7cb3b485644a98dd78f40b58b3d68746b909b69e38fc294ce96307c45972a6
font_01_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 10800 bytes
SHA-256: faa0a547f270b551880e54243a2f2773b7f39cb7602cc5ea5bd78de6f64b654e

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