Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd743a66d8a0b49…

MALICIOUS

PDF

80.5 KB Created: 2021-05-13 13:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 783fd8fb1a0ff776e5a90f1c45e23ffd SHA-1: a32d5830ad030316b1f527e4d8ad6c0c2bf6af31 SHA-256: 5fd743a66d8a0b49d3715b545145caf4252f0ea7cbf222290a29874e50585418
226 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. Heuristics indicate it's an advance-fee scam lure, attempting to trick users into clicking malicious URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://bologen.ru/strik?utm_term=conflict+management+styles+questionnaire
    • http://suporefebakibur.mygamesonline.org/dinike.pdf
    • http://dimopun.mywebcommunity.org/2049372820.pdf
    • https://wojadamizaxit.weebly.com/uploads/1/3/2/6/132681796/71c325a523.pdf
    • http://lazerepil.site/7250470129ti1ni.pdf
    • https://lerinaxupol.weebly.com/uploads/1/3/4/6/134662503/koxuxix.pdf
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/malegow.pdf
    • https://static.s123-cdn-static.com/uploads/4479916/normal_5fc5a40655eea.pdf
    • https://mafalipakirufez.weebly.com/uploads/1/3/5/3/135347960/5481671.pdf
    • https://cdn-cms.f-static.net/uploads/4475847/normal_604d753d068fb.pdf
    • http://pixelbarista.com/gobexngr6z.pdf
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/najorowudigifur.pdf
    • http://arendaavto.taxi/gunofivibewopuxoqhmb1.pdf
    • https://cdn.sqhk.co/buzivafulet/eRVjcgd/buwuloto.pdf
    • http://zoomita.space/file_profile._dat_dls_17as4aw.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/vocabulary_words_for_7th_graders.pdf
    • https://cdn.sqhk.co/sategexarom/QW1aijm/serefinigizisonusuxeju.pdf
    • https://cdn.sqhk.co/lazodadevab/CgSjhgg/52853466789.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe27.bin
1bfc087069a52b5a363e0821796b6b7e2d5f4517ca809527871e7f904a69c9d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 5332 bytes
font_01_sfnt_off0001103a.bin
cc523edc9b6f9f292c38374ce68426ae0b34e9cb9dd887f32c0ec495fc9f3c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 10864 bytes

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