Malicious PDF — malware analysis report

Static analysis result for SHA-256 394b99e7c38efd4e…

MALICIOUS

PDF

85.3 KB Created: 2021-05-12 14:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bee11be376ebdf57ca5f9518f1a6fb3 SHA-1: 501566ecdfeb6d60f101f2171222210a0e1430c1 SHA-256: 394b99e7c38efd4ed2c73228e2f5bd976b0c4714933aa3de3e911747d89bd800
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The presence of embedded URLs suggests an attempt to redirect the user to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=pyramid+principle+structure
    • https://vimikipemaw.weebly.com/uploads/1/3/4/3/134331773/99f12f91.pdf
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/lifajuvaxab.pdf
    • http://abreudesigns.com/bose_qc15_ear_pads_amazonwk6hd.pdf
    • https://cdn.sqhk.co/dedogupazib/UgcHjj8/juvaku.pdf
    • http://nefufovej.22web.org/how_to_fix_a_mercury_thermostat.pdf
    • https://cdn.sqhk.co/nebemina/iOjcggQ/khloe_and_tristan_news_youtube.pdf
    • http://reawont.online/620201251804u0rc.pdf
    • https://futafapegimato.weebly.com/uploads/1/3/1/8/131855997/momogilop.pdf
    • http://cosmicgig.com/what_are_the_odd_functions7oi0w.pdf
    • http://ig-socialmedia.xyz/how_big_was_americas_army_in_ww29zzu2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nufeluzuxaluw.epizy.com/agriculture_technology_in_israel.pdf
    • http://kosidigipetuvu.epizy.com/80_longwood_lake_rd_oak_ridge_nj_07438.pdf
    • https://uploads.strikinglycdn.com/files/69201ed5-4014-43d5-b15a-5b6c5b32648c/8266378278.pdf
    • http://ninalosuza.rf.gd/72359361802.pdf
    • https://uploads.strikinglycdn.com/files/b2b28697-70e8-4531-9ccb-f6e458a2d0fd/hoist_v5_manual.pdf
    • http://nokivegodixisi.rf.gd/kenmore_90_series_dryer_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/fefbe0b8-dafb-47bd-8e4d-22ddb0676b9a/panasonic_inverter_microwave_oven_grill_function.pdf
    • https://s3.amazonaws.com/teximikamukubo/learn_to_draw_for_kids.pdf
    • https://s3.amazonaws.com/dukajevo/37185486187.pdf
    • https://s3.amazonaws.com/temujonuwu/7672397291.pdf
    • https://s3.amazonaws.com/telasebisu/36966836733.pdf
    • https://s3.amazonaws.com/safago/remington_outlaw_20_inch_chainsaw_reviews.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_off000111ef.bin
e534be6ffea10e02e790d02991ffff60b0e9d07bb7e7beb5eab79317c6a8babb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 5320 bytes
font_01_sfnt_off000123f9.bin
20e31c309d0d59815bb9e58fd29f8d90f1a0f891270adb999a493ca5e5ecdabc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 10512 bytes

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