Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bed4d85da64ea70…

MALICIOUS

PDF

73.7 KB Created: 2021-02-11 19:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9c9b89677ac260696e769ba922961136 SHA-1: 79d0c47592ae20a5c3aec8fa1be5bfb5fe4d6aa9 SHA-256: 1bed4d85da64ea70df47fd225ab96035f6bfbe2388b7376f364f280f8d499e4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of such infrastructure for potentially deceptive purposes.

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://jottigo.ru/wb?keyword=company%20of%20heroes%20%20free%20full%20game PDF link annotation
    • http://mazers.fun/englisch_arbeitsbltter_klasse_5msv5z.pdfIn PDF document text
    • http://optamorem.com/demon_hunter_tanking_guide_7._3navg0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5fcf1bc061160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428078/normal_5fc6bd51e3b88.pdfIn PDF document text
    • http://triple-doska4.club/sultan_movie_online_watch_free_hd_hotstar6aewh.pdfIn PDF document text
    • http://energytik.net/63494067845yzk3t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5fd3430a24ac8.pdfIn PDF document text
    • https://cdn.sqhk.co/beluvano/hicjd86/7_key_leadership_traits.pdfIn PDF document text
    • http://exemplpusj.com/tesoviseduluwiwatx2hdq.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/hc5Qxhe/baby_shark_run_away_lyrics.pdfIn PDF document text
    • http://amst-watch-v2.club/47187449594ipmt1.pdfIn PDF document text
    • http://prostotit.site/wilderness_survival_movies_on_hulus9z8l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ff3f4e6e9550.pdfIn PDF document text
    • http://detonic-italy.website/20465508565whtph.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/aVOAr3r/guess_the_movie_quote_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367625/normal_5fcedacbe3c5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenamumiv.rf.gd/98137778133.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/gabozegimukabuzadinato.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/rafote.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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 5320 bytes
SHA-256: 900e43dc47c544a05f0b3be2ad2b9562b1804d7bf5e6f81d5a393873bbba43d3
font_01_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 10424 bytes
SHA-256: 24f9e3d45c2aa9dc4001dad8e41743bdfc85cd70cbacd8cc8ac23f55d2ba2c96

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