Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd78da3e9841a6c6…

MALICIOUS

PDF

82.1 KB Created: 2021-04-25 20:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 125e2c02331619b743721d19fb52d5d9 SHA-1: 4c7025c34469674b1e8069ccaed151180c6721b7 SHA-256: bd78da3e9841a6c6680d6bcec1e0dba5dd5546a704daba3d271b6163276326c2
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are designed as a link farm. The document body, though heavily obfuscated, suggests a lure related to downloading a game. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=how+to+download+gta+5+on+xbox+360
    • https://cdn-cms.f-static.net/uploads/4416932/normal_604ee97860041.pdf
    • http://wotidoteked.mywebcommunity.org/acute_toxicity_testing.pdf
    • http://fredo.run/online_barber_courses_ukerjvm.pdf
    • http://knitfqph.site/peg_perego_john_deere_gator_battery_lifedfxkv.pdf
    • http://wugegifa.getenjoyment.net/adverb_clause_worksheets.pdf
    • https://static.s123-cdn-static.com/uploads/4464873/normal_5fcef9dc96f25.pdf
    • http://devicesprotectionforusers.site/rakosukebexul45yg.pdf
    • http://eslivdrug.space/what_size_file_for_poulan_18_chainsawgqfzo.pdf
    • http://help-igcopyright.xyz/cool_icon_pack3lexy.pdf
    • https://cdn-cms.f-static.net/uploads/4471719/normal_60407040e5d42.pdf
    • http://uscarins.info/539739386150pd0f.pdf
    • http://propovar.ru/79939252086debo0.pdf
    • https://cdn-cms.f-static.net/uploads/4418197/normal_6011928624e6f.pdf
    • http://the-job.ru/m-audio_keyrig_49_reviewg997g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rawozenagi.epizy.com/carmageddon_2_android_apk.pdf
    • http://wazuvit.rf.gd/akuntansi_biaya_full.pdf
    • http://dijuxuzuzame.rf.gd/vitamix_5200_blender_refurbished.pdf
    • http://moxuzaridob.onlinewebshop.net/depasax.pdf
    • http://rugeritubaduw.epizy.com/ansys_classic_tutorial.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe7.bin
78d4d9bf6e4e344f91ad087acb25dcbc995f5f54039247b3e0ad015c3ccc7329		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 5184 bytes
font_01_sfnt_off000101a9.bin
ffcbf4d04462b437f335e78b82bdfcf31d9d8a22f7e3470c10a1d99c25cf276e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 13028 bytes
font_02_sfnt_off00012b1a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1A 4324 bytes

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