Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8055bb86d63713…

MALICIOUS

PDF

79.9 KB Created: 2021-04-08 23:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c25c813112f5776c55e801d2cf7a0df4 SHA-1: 85847831e69fb29836fa2dc9bf648f0fc5a45bb1 SHA-256: 6c8055bb86d63713a0a55c5704b0ccffa2671b0a845ee265160ff7200277b7b3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded URLs, with one prominent URL pointing to a suspicious domain associated with phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to printer maintenance, designed to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=how+to+remove+paper+jam+from+hp+officejet+4630 PDF link annotation
    • https://vegekevovixo.weebly.com/uploads/1/3/1/4/131437475/15a1947da5.pdfIn PDF document text
    • https://duwujesipegon.weebly.com/uploads/1/3/4/8/134883919/maleragatesabip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_60198b482fdb1.pdfIn PDF document text
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/todududidodew.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/how_to_calculate_efficiency_of_3_phase_motortjevn.pdfIn PDF document text
    • http://presentinsta.site/stephen_king_movies_best_horrortgy49.pdfIn PDF document text
    • http://yachtcharter.group/lotuwunafmxzow.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/mapa_municipios_comunidad_de_madrid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_6024cc59621ea.pdfIn PDF document text
    • http://shoop-fn.ru/schwinn_airdyne_ad2_partsd3oyg.pdfIn PDF document text
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/6ff790ce0d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/45bbce27-4224-4de7-8b8b-fc21ec4b0b77/pocket_juice_hybrid_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087911ec-e36b-49c2-b88c-9d2e26963e66/46224487218.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_66e4ea75bda749f6b59df73e8ca402ab.pdf?index=trueIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/dajadavuvevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a32985-36f7-4789-b6ad-5cc3519e9652/67688532633.pdfIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_131611d54f344f42bfa0779f361f2f71.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_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 5784 bytes
SHA-256: f2914e6d085b78c28aa3340b87f78844fbf07a8151ae0e2ab21f306e3053625a
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 10432 bytes
SHA-256: 8e32a8535940de358f5b6fcfa762a57900c1e5155c3bbe77214a5440e0fbde41

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