Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1044b330d709a2…

MALICIOUS

PDF

71.7 KB Created: 2021-03-31 23:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6736609a2b932985b24b145443e7d250 SHA-1: 549e450f205cc09981a9d2c472902eaddcdad20e SHA-256: dc1044b330d709a252da97b4f13bf23a4636622834299c0f519e1be0b3313655
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily obfuscated, contains keywords related to 'biology pdf miller and levine' and application metadata, indicating a lure to disguise the malicious intent. The presence of external URIs and a link farm heuristic strongly suggests the document's primary purpose is to redirect users to potentially harmful websites.

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://xajibur.ru/award?keyword=biology+pdf+miller+and+levine PDF link annotation
    • http://lumejaramelu.mygamesonline.org/biwuguboxevixo.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/fisicoquimica_castellan_tercera_edicion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_6023f1046c387.pdfIn PDF document text
    • http://moscow-siberian-force.online/easy_vegetarian_recipes_for_picky_eatershog3m.pdfIn PDF document text
    • http://xeratigike.medianewsonline.com/lufetuwozilivetimokud.pdfIn PDF document text
    • http://goldotzyv.ru/8767374414070rk.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/goguvowexewafu.pdfIn PDF document text
    • http://tryplafond.xyz/posentri14.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/courage_to_be_disliked_book.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/nanubuka.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/dream_girl_full_movie_openload62ogz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_60357067cec9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_60392257eb59b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wujagenak.atwebpages.com/amsterdam_travel_map.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_7f261cc0e59f43589e0b63482e8d4718.pdf?index=trueIn PDF document text
    • http://mifojizu.myartsonline.com/47496331008.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/are_tecumseh_motors_good.pdfIn PDF document text
    • https://1dda4824-043e-406b-9213-03d4b91bb4d1.filesusr.com/ugd/7695bb_534db9a3b65e4034ad45da8b173eabb5.pdf?index=trueIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_a7c3c5710fd34000ade996c7581ff081.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomuper/pgcil_er_2_answer_key_2018.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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 5396 bytes
SHA-256: 100def169b2a7089b597fd092baa70a6369a9878d0555439813d054733eb4cd2
font_01_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 12040 bytes
SHA-256: 72f291e27ae06f48fe3303920a3c4600ad91a7280ee23ebc5e6a2f6617e3d794

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