Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d63dc740f7df75…

MALICIOUS

PDF

68.9 KB Created: 2021-03-16 22:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb15840f98b50d42bb2b0f56069dff82 SHA-1: 354123925ea09fd6ba4af4780375b2473f6c24dc SHA-256: b4d63dc740f7df753295b23e188b93b5548e9993956b7650f65dccf00faa9d30
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 pointing to disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a game guide, directing users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://resalured.ru/strik?utm_term=diablo+3+reaper+of+souls+game+guide
    • https://cdn-cms.f-static.net/uploads/4500438/normal_6049b24e58179.pdf
    • https://cdn.sqhk.co/zerurukoraju/nhg5hgp/surprise_eggs_games_for_toddlers.pdf
    • https://cdn.sqhk.co/welosezu/ahc4jif/bass_i_love_you_song_free.pdf
    • https://static.s123-cdn-static.com/uploads/4417119/normal_600549f04725c.pdf
    • https://static.s123-cdn-static.com/uploads/4374532/normal_60078b94dcdad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_5a4994337ea145fbaf62c18892500d7e.pdf?index=true
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_520795e9162048a3af7d333d45f11d24.pdf?index=true
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_5f19d8a0e29d47ba8a45c772810b9903.pdf?index=true
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_23967b33c49c417695f9ea8f071ad97b.pdf?index=true
    • http://jokosalona.epizy.com/51471118647.pdf
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_13aaaf7d2d0b4eed80fa29c8cddc9566.pdf?index=true
    • https://s3.amazonaws.com/tugabijenovili/bumbleride_indie_twin_2017_manual.pdf
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_2825799ad525442bbe35de5b4325614e.pdf?index=true
    • https://s3.amazonaws.com/kijelopazekune/15800251922.pdf
    • http://lojuwuwa.rf.gd/27997401723.pdf
    • https://s3.amazonaws.com/pezofut/setaxafatibenomabararevo.pdf
    • https://s3.amazonaws.com/nawuvud/51916688839.pdf
    • 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_off0000cf08.bin
d19751c4bb502cfdccf7f216a33c19156ba578e0fd392f33985e1d79c08880aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 5664 bytes
font_01_sfnt_off0000e235.bin
a460accf65b34cabadc9664e3c2dce682b8d5fd9ab5ebd1b1245a2e608555b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 10952 bytes

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