Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a4fe34b777e7d4…

MALICIOUS

PDF

77.0 KB Created: 2021-04-12 09:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 995bd74c2f0d35f8a152472e384b4232 SHA-1: 35fd274e1d8e415aeed38d028c1621d0604a6baf SHA-256: 69a4fe34b777e7d4151690a91d3f7ff52df36878764b9c41dafd1074788d8a96
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack, likely using JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/strik?utm_term=which+is+the+best+asvab+book+to+study PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387229/normal_6056770412e42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415530/normal_604cf2aa47cb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_603b9afbe105f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_6013b07e96f14.pdfIn PDF document text
    • http://shortsomfj.space/how_to_do_conditional_probability_on_ti-847m9n2.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/negujizutugizomajukokes2k9hm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_600a98f3b7ca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_606e4133e1b59.pdfIn PDF document text
    • http://shoop-fo.ru/business_english_for_beginnersjp2gd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_602f31903be36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_60608a21deadc.pdfIn PDF document text
    • http://help-bluebadgecenter.com/acer_nitro_5_15.6_gaming_laptop_i7rjycj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_605667dbb55de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427799/normal_5fc75a41df9fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limixumijegaf.epizy.com/87594666153.pdfIn PDF document text
    • http://kuwanuzoniwod.rf.gd/ramesonuzupiwub.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_bfccc17060d041b5b6bab3d2dcf1ab18.pdf?index=trueIn PDF document text
    • http://lalufelamuxijif.rf.gd/zegolufeperodad.pdfIn PDF document text
    • http://silaworavolelun.rf.gd/burger_king_menu_double-whopper_price.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_c138fb956bcb46f8bc23653ec7a61286.pdf?index=trueIn 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_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 5276 bytes
SHA-256: 4e89e6e5909d678ad6537649bcc77e30ce6bc8b23762ec267af34c7e423e67c0
font_01_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 10648 bytes
SHA-256: 20f886c708e84e9caea20b5bc8f2c081fabf316b4b38e364e04f9db19289ad88

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