Malicious PDF — malware analysis report

Static analysis result for SHA-256 6983b8b3b94f2d03…

MALICIOUS

PDF

82.6 KB Created: 2021-05-01 01:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 766d5b3e55ed4c33b5d95936e29dc0ad SHA-1: 5c6ea22abda2512ec75ff443b5e15c6ead273dc3 SHA-256: 6983b8b3b94f2d039b70f7f65d07b28d6624cd6f7c3c72cc1adbb9a98841c5a5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=what+is+the+duration+of+ethical+hacking+course PDF link annotation
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/2538794.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/09d9bf64a9cbb39.pdfIn PDF document text
    • https://viremekim.weebly.com/uploads/1/3/1/4/131407965/bozixin-jabetuwaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383160/normal_5ff28e8a0e1c6.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/5b862feba63d0.pdfIn PDF document text
    • https://retezuve.weebly.com/uploads/1/3/2/7/132741149/vedesasuditux-vuferisur-dawekadusu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464072/normal_5ff05c6aa276b.pdfIn PDF document text
    • http://papotupeti.iblogger.org/18002317550.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420235/normal_5fed58ac49c81.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/38211b5a-02c1-405f-bd45-6e2f28c04fe4/war_of_the_worlds_2_the_challenge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ffd61e-f9d4-416d-8aed-89fa8409ba95/49095247737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/991f5d07-ed5c-403d-82f9-2568f1456252/gawofugunu.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/beyond_meat_investor_presentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468ff362-64af-43e6-9bca-ab47c2cac3a0/56325039916.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/best_rap_beat_ever.pdfIn PDF document text
    • http://daluzijirajof.rf.gd/algae_biodiesel.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/animated_powerpoint_presentation_slides_design_free.pdfIn PDF document text
    • http://mifedisiso.atwebpages.com/breastfeeding_vs_formula_feeding_advantages_disadvantages.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_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 5360 bytes
SHA-256: 444172078c788c53ca5419f307eeb406ab2046a7a8642fe0a658d2b93e241cb0
font_01_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 11192 bytes
SHA-256: 12fc643111a5063d1ff680122b6b7c6da4154faf922f2f1b797b91a71ab1b28b

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