Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b6d84b5bcccd9f…

MALICIOUS

PDF

70.5 KB Created: 2021-02-07 12:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6b87e4699ef002d57defedea74d7530b SHA-1: 9b967af95d99ee38ada1562fb47df9590ce664cc SHA-256: a9b6d84b5bcccd9f76bc46a14e5d906209acbe1f86c18b217ab0b33e701b4409
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of numerous external URLs, including potentially malicious ones like 'https://bologen.ru/123?utm_term=impaired+gas+exchange+nursing+diagnosis+heart+failure', indicates a phishing or malicious redirection attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

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 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.
  • 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://bologen.ru/123?utm_term=impaired+gas+exchange+nursing+diagnosis+heart+failure PDF link annotation
    • https://cdn.sqhk.co/ribobujir/Pga3hfC/unblock_me_free_game_play_online.pdfIn PDF document text
    • https://rizenuwav.weebly.com/uploads/1/3/4/3/134335920/labegaserusamin-xuwamuwuza-ravabuvidusesaz-jijopajerogosu.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/jcyXhgh/31432845292.pdfIn PDF document text
    • https://foxujutuz.weebly.com/uploads/1/3/4/3/134348357/69ecf078dd0.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/sokejegewuxum.pdfIn PDF document text
    • http://titanovyi-filtr.ru/aarakocra_5e_statsugygm.pdfIn PDF document text
    • http://comforfemj.fun/evangelismo_dinamico6vnvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_60188c391a8bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sirowozikuko.epizy.com/thyroid_gland_structure_and_function.pdfIn PDF document text
    • http://tavupovasar.rf.gd/banyan_tree_3d_model_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/interest_groups_icivics_answers_the_potato_problem.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/ieee_latex_template_online.pdfIn PDF document text
    • http://kanusilos.epizy.com/sound_engineering_books.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/vaxile.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/livofoxumefun.pdfIn PDF document text
    • http://vulewibof.epizy.com/76964091011.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_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 5576 bytes
SHA-256: c8c1f777659f1cb865ba291751fe693fdb6f461686d6d48695154ce1a187e98e
font_01_sfnt_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 10236 bytes
SHA-256: aebcb04f620dbfac3397b5faa3fc56de0b591f68e08a394a48e06618f4355ede

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