Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c900275ce0f1283…

MALICIOUS

PDF

83.8 KB Created: 2021-03-24 18:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ba3f3b42bc4a83451b25107a35052e SHA-1: 7a43c4375c66e9f32cb85d5e43fb1c46e21ed51c SHA-256: 6c900275ce0f128303d2398759de6b0a3569e59ba1881b5f5b4f95c4354f0ba9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of 'utm_term' in one URL further suggests a phishing or spam campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's used to distribute malicious content or phish for information.

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://vilenefex.ru/123?utm_term=web+developer+websites+templates
    • http://wtia.space/how_do_you_make_simple_syrup_for_cake2ake5.pdf
    • https://cdn.sqhk.co/dukapudubi/jewX9hd/asteroids_2020_october.pdf
    • http://vsspb.ru/kingdom_hearts_1.5_2.5_trophy_guide_ps4goddt.pdf
    • http://susurrus.space/12543383014itbfn.pdf
    • http://lorenbayi.com/walmart_black_friday_2020_event_3fy7yv.pdf
    • https://cdn.sqhk.co/pulununese/ePCPoha/83963055558.pdf
    • http://ppl-nutrshopfit.website/86139484696otmxx.pdf
    • http://lofitner.buzz/gawutodogogovoh8c75.pdf
    • http://numberoone.xyz/compendio_de_fisiologia_guyton6hj3o.pdf
    • http://cpskras.website/ferore425d9.pdf
    • http://raisinsapp.pro/887424335074lpwn.pdf
    • https://cdn-cms.f-static.net/uploads/4459321/normal_602bb1b731f11.pdf
    • http://foyou.store/milenyi4mt.pdf
    • http://aov.one/gipalizokikufaxiwew90ocm.pdf
    • http://blablablacar.online/articles_of_constitution_download2uszq.pdf
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fe08c64c8bb7.pdf
    • https://cdn-cms.f-static.net/uploads/4453333/normal_603b5c68ad861.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_78e538246bc0419192501d2d86335f03.pdf?index=true
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_2b4487ab80a741699042ddc48b2dceb8.pdf?index=true
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_00d362bfc1404278892fc5d4f6b86852.pdf?index=true
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_21e792f335734948b91e7f8a7a712636.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108de.bin
8ad7f00afc7b04122c5c1494b3900d8bdc58188802df58bd6e4a028762b3bbb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 5412 bytes
font_01_sfnt_off00011b3c.bin
4764880f121cabe432c91eec2ed1a0820c9b439aa23909f0db1a18f390030e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 11804 bytes

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