Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9f401e844fb800…

MALICIOUS

PDF

70.9 KB Created: 2021-05-12 10:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f3ee2aafde19b88fff75a1b18cd814d7 SHA-1: 3c155ae71ad82afaf543b8095c97c24c437ba192 SHA-256: dc9f401e844fb800d7a488bcd2352d2f98cbab5cee1a64b5391b3a46788ec09d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and a link farm heuristic suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=unitypoint+employee+email PDF link annotation
    • http://handler-autoscout24.com/11060668964vi6a2.pdfIn PDF document text
    • http://metalllift.ru/guxidanositacmrtk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_5ff411394fa28.pdfIn PDF document text
    • http://bio-ita.fun/tudakidvh2y.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/iigd3gg/vumipoborano.pdfIn PDF document text
    • https://cdn.sqhk.co/zigotimuti/hem9jd7/97044221641.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/jdibKji/avengers_xbox_game_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_6062aba89668a.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_603e5e9fd3210.pdfIn PDF document text
    • http://reawolt.online/lirr_train_schedule_todayci6l0.pdfIn PDF document text
    • http://bet-info.ru/accelerator_plus_10_crack2d1r9.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/0jgWiiL/fun_kid_racing_car_game.pdfIn PDF document text
    • http://myfoxing.online/im_essentials_acpdmtzd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_600a6cafd5b0a.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefoveniri/jRXfWib/ikea_kitchen_installation_guide_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_60180b4bb303c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_606b35a843946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_605f982fdbd88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_600d5c96bf190.pdfIn PDF document text
    • http://insurancesouk.com/velas_japonesas_libromkjaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 4784 bytes
SHA-256: ba4f9f240f23cb41f87562b10c98f636164c8be908ade250413dc99fab851f67
font_01_sfnt_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 10816 bytes
SHA-256: ed9ecf1a9ec78d223599ede49a2a8be9cb97dce6878247378c0ddf56fe5cae7d

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