Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8bf5b73cf1a28d…

MALICIOUS

PDF

88.6 KB Created: 2021-03-01 09:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 11d338d49d7c31b77f41ace732fe64b1 SHA-1: 5e6ed252ec59a1dd3d73a7c7a17507c11aa8524a SHA-256: 6a8bf5b73cf1a28d3c1af9a9cf4858bd9551bde30d4cda562ff3889a532313f7
174 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of 'wkhtmltopdf' in the metadata suggests it might be a generated PDF, possibly to obscure its true nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pelibifir.ru/strik?utm_term=constitution+of+the+communist+party+of+the+soviet+union PDF link annotation
    • https://cdn.sqhk.co/goworonol/phfxhie/honey_smart_shopping_assistant_chrome.pdfIn PDF document text
    • http://1-bog.ru/55668884406y56ii.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/jbThgja/scruffy_meaning_in_english_dictionary.pdfIn PDF document text
    • http://lovemecompletely.com/94353651636jezrx.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/desavikunonuz.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/mabafopevanix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_601138cb84578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_5fcb9856588d7.pdfIn PDF document text
    • https://cdn.sqhk.co/xobakidanav/NtuPnhd/takifuserabovilaw.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/zwgeTig/sector_14_market_gurgaon_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_601dc17bd23c0.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/qdQchcE/37306528325.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/lomasamube/giegeja/mini_bowling_set_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/UTrCZij/top_hits_of_the_90s_and_2000s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_6004cc13a2e97.pdfIn PDF document text
    • http://best-store.club/8878700091d5jsp.pdfIn PDF document text
    • http://kernig.online/why_is_fast_food_unhealthy_essayepgq0.pdfIn PDF document text
    • https://cdn-cms.fIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likutolejit.onlinewebshop.net/what_are_male_female_and_baby_goats_called.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/divine_mercy_image_original.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_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 5288 bytes
SHA-256: 4ad7f4f89602ce0d3e654c7b746836a20dd8bf2eda4430ac4e8ccf53456ef525
font_01_sfnt_off00012e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E43 11232 bytes
SHA-256: 197d1eebcf0d73e93977ae359df4d2fd99b945b61608eebce2fb81e915426390

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