Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d4256f6573c2bf…

MALICIOUS

PDF

55.4 KB Created: 2021-03-13 14:04:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7239eb30e7d5233550c7814cf268d118 SHA-1: 410bca7b2ae843758700beb74711f07aa2015706 SHA-256: b8d4256f6573c2bfbf65b9f14a90bc7c54a552a6f8e48e76821c6ce3aa5a866c
242 Risk Score

Malware Insights

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

The PDF file contains numerous links designed to redirect users to external websites, masquerading as cost accounting notes. Several heuristics indicate this is a link farm hosted on disposable infrastructure, with one URL pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6719

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/award?keyword=cost+accounting+notes+for+b.+com+3nd+year+pdf In PDF document text
    • https://cdn.sqhk.co/kawinojos/FrYgjhb/kivununirafefuvot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476274/normal_5ff33ba15bae7.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogusobade/K7eigia/tanglewood_elementary_school_lumberton_nc.pdfIn PDF document text
    • http://afracheat1.xyz/12140005640udksl.pdfIn PDF document text
    • http://monoga.space/woduguxegasorobokoppoyqz.pdfIn PDF document text
    • http://krokoboko3.xyz/xomafifotevafavelezabuzagduh1.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/j3TqkK2/brhs_nj_website.pdfIn PDF document text
    • http://physcoo.com/music_note_tattoo_behind_ear_meaningx374x.pdfIn PDF document text
    • https://cdn.sqhk.co/zesunotu/EdjehjG/skyrim_elder_scroll_blood_id.pdfIn PDF document text
    • http://ergors.space/85877408480e57nh.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/nwicjeV/creative_approaches_to_problem_solving.pdfIn PDF document text
    • https://cdn.sqhk.co/podadoxafa/LlRwwjd/jarusoxoxirurilo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459177/normal_5ff0e3b6f2de1.pdfIn PDF document text
    • https://cdn.sqhk.co/kifateten/ZTgcVjg/piano_tap_tiles_melody_magic_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/jaGlahG/49580391877.pdfIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_43f4c3d0738749b28d39265ef98d3ccd.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_8417d44214284f888e449eeeb2189881.pdf?index=trueIn PDF document text

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