Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7c6f1adeb98e04…

MALICIOUS

PDF

74.3 KB Created: 2021-03-11 09:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 77fb56c33fcc06dcb28d027822e55180 SHA-1: 590c5fea50917ce4d7aec8ac19e785fb3c5757e0 SHA-256: 8f7c6f1adeb98e04f6f99b1eede314d91abdb1ad4e6555d32e755f16b035aa11
126 Risk Score

Malware Insights

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

The PDF file is detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'physical and chemical properties of alkenes pdf'. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/award?keyword=physical+and+chemical+properties+of+alkenes+pdf PDF link annotation
    • http://talemine.getenjoyment.net/65558010880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_602649576b8e5.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/xuxusowo.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/97875373608.pdfIn PDF document text
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/tarexid_naxewebokilupob_kapofetade_sediziroketo.pdfIn PDF document text
    • https://rapinawenag.weebly.com/uploads/1/3/0/9/130969945/gijudefemunimimef.pdfIn PDF document text
    • https://biwojifagape.weebly.com/uploads/1/3/1/3/131381518/futodine-xifudave-tawabagumanef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_603cbccd4e28a.pdfIn PDF document text
    • http://wijawoga.22web.org/the_wave_todd_strasser.pdfIn PDF document text
    • http://fomoregekamikat.mypressonline.com/19809470859.pdfIn PDF document text
    • http://zabidegelid.iblogger.org/how_to_try_planet_fitness_for_free.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/zezekakurewo.pdfIn PDF document text
    • http://kajuzumanaz.sportsontheweb.net/canadian_citizenship_application.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/make_your_own_podcast_intro.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/rawiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rolubumemetujin.atwebpages.com/youtube_videos_panchatantra_stories_in_hindi.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/g_shock_watch_lt_meaning.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/wefuxegotajabodobe.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/panasonic_microwave_oven_convection_grill.pdfIn PDF document text
    • http://xutunebel.epizy.com/88619636939.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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 5564 bytes
SHA-256: 80693d57e69301d45278a6e29ae11edb077fe03942b5720a9f6f57611b5c36de
font_01_sfnt_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 10500 bytes
SHA-256: b7d161c24e4bdb049989085428f152c69c271085d0ab9663667a2e4fa24822ff

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