Malicious PDF — malware analysis report

Static analysis result for SHA-256 418937109add8dc4…

MALICIOUS

PDF

75.8 KB Created: 2021-04-27 13:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 007e1c5ddf8ee19feecbf05092d8bc70 SHA-1: 7bfcd524ee527e89801d9a1b95d2dfed0bd820ca SHA-256: 418937109add8dc48bb9ff2617e41d02f3f7eb2daf8c4f48d14c8f846e095b0e
186 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, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=buderus+gb142-45+parts+breakdown
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/6d1fcd894f2.pdf
    • https://nuzuloluxeguvox.weebly.com/uploads/1/3/4/8/134874948/jubawixovidi_dabikirixab.pdf
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/9257648.pdf
    • http://vodizurulenega.mypressonline.com/57098612756.pdf
    • https://sozagigojo.weebly.com/uploads/1/3/1/4/131454883/firirofuru.pdf
    • http://kuviruvada.getenjoyment.net/70352114133.pdf
    • http://gukapeb.iblogger.org/12856967033.pdf
    • http://nimiridisavir.22web.org/android_studio_emulator_adb_connect.pdf
    • https://cdn-cms.f-static.net/uploads/4402250/normal_6066a8242a3db.pdf
    • http://wejowadizabudex.mypressonline.com/69066671989.pdf
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/58a14ed55f96c.pdf
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/7999156.pdf
    • https://cdn-cms.f-static.net/uploads/4473645/normal_606cce937270e.pdf
    • https://tijikazi.weebly.com/uploads/1/3/4/3/134373218/47587b9fc3.pdf
    • http://juwoniki.getenjoyment.net/b_tech_colleges_in_maharashtra_list.pdf
    • https://cdn-cms.f-static.net/uploads/4369191/normal_604696ad891d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tokozod.myartsonline.com/xobinere.pdf
    • http://xenezipulugiji.atwebpages.com/xudukosodibebejuderofile.pdf
    • http://jepogedepujadul.rf.gd/how_to_use_noco_genius_boost_pro_gb150.pdf
    • http://xidemovuzedep.rf.gd/kuzotepigimudodat.pdf
    • http://niwuzowebod.epizy.com/thats_the_way_of_the_world_song.pdf
    • http://jabejanaboz.atwebpages.com/nukeritiberowamaken.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_off0000ead2.bin
1fdda545b9a1bb95e2f662b68c2177d00dc958a8818027fa66be930b45c7bb19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 5868 bytes
font_01_sfnt_off0000ff00.bin
fb62694a882e975105800a4b0ec81268b07a38f069adb0058a46f2aeab34d9c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 10368 bytes

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