Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3f3616e440d0e6…

MALICIOUS

PDF

73.3 KB Created: 2021-04-03 05:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 21ee8d30cabcb6e2f14205d857281f8c SHA-1: de6bd704bd1a416567212649edd39fc3e0ac49c8 SHA-256: 8b3f3616e440d0e68442b6e6e2f7748fafd915c1575886512cbaefc95544f4dd
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 of which point to disposable hosting services, indicating a link farm designed to direct users to potentially malicious content. The primary URL, https://mezovuduw.ru/strik, is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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://mezovuduw.ru/strik?utm_term=chronicle+of+a+death+foretold+chapter+2+pdf PDF link annotation
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/1810606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425726/normal_5ff1de00115f6.pdfIn PDF document text
    • http://vafuvavepoti.22web.org/mosuzajitux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417139/normal_6047042c7cdd6.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/xilajemube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461207/normal_5ffad5d6205b4.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/b2e15059a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepevalir.rf.gd/laruwazatopisege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9265385-e325-4351-a3b1-2b6bd047e904/totugifetisodag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6500b72-8906-445e-ae25-4c2eaf3b94d0/how_to_change_name_on_drivers_license_after_marriage_maryland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce1da6a-348d-4504-aa1c-cb80ac723aaa/josevukerejut.pdfIn PDF document text
    • http://nowaginog.epizy.com/90167686078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e0364e-a7e6-41a3-bb07-16647144b6dd/samsung_grand_prime_price_in_pakistan_2018.pdfIn PDF document text
    • http://litaludoxuba.epizy.com/bakemonogatari_novel_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a09e53-4390-4379-b039-761fb58b8d73/35462423710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7655982-f4f5-47c4-9fbd-c5791227c03b/all_verb_list_a_to_z.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e76ed2-033a-4736-8c36-6a182d53dbd5/79025835788.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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 5104 bytes
SHA-256: 90a0bc41876a2ed23e8462a49da19738cc2daacccc742c01cde99ae769ec05b6
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 10356 bytes
SHA-256: dcf8171a0cde863731fdcc8b00c5846b52069feec1eaf337f08949f8c16edc36

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