Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f940589da9d6529…

MALICIOUS

PDF

97.3 KB Created: 2021-03-21 10:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 911ab32b5408a980c86c26b0ec5fefb7 SHA-1: 88b755f06efb9657c11309191d0b8c09473be2f1 SHA-256: 8f940589da9d6529e75fdf291756cb09bf34e4dcbc388eaf1325ea934b4a77dc
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Patton milkhouse heater instructions' which redirects to a suspicious URL. The presence of multiple disposable hosting links further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ponafet.ru/strik?utm_term=patton+milkhouse+heater+instructions
    • http://uscreditcheck.info/pallet_jack_repair_service8h5tc.pdf
    • http://rajulosukoxejof.22web.org/jujokudomitisusedijilemom.pdf
    • http://creditscoretracking.info/64761721627iic5r.pdf
    • https://cdn-cms.f-static.net/uploads/4468294/normal_60334a1e08205.pdf
    • https://static.s123-cdn-static.com/uploads/4473637/normal_60064bd2a27ab.pdf
    • http://fb-ig-violation.com/ccmsetup_failed_with_error_code_0x87d00280unybf.pdf
    • https://cdn-cms.f-static.net/uploads/4409614/normal_5fda452d37c98.pdf
    • https://cdn-cms.f-static.net/uploads/4451742/normal_601e21d0dfdce.pdf
    • https://cdn-cms.f-static.net/uploads/4480891/normal_5feaeebe7b4fd.pdf
    • https://bifulegipemafus.weebly.com/uploads/1/3/5/3/135312859/a74cfc7913d.pdf
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/xorajiwozisu-dasafen.pdf
    • https://static.s123-cdn-static.com/uploads/4480891/normal_5ff24fb910035.pdf
    • https://cdn-cms.f-static.net/uploads/4489725/normal_604cb9970b7a2.pdf
    • http://babysampler.com/johnson_25_hp_2_stroke_oil_ratioo1xbp.pdf
    • http://lofitner.buzz/nagedihpsg3.pdf
    • https://static.s123-cdn-static.com/uploads/4465688/normal_5fc9a70243906.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/faluzotixupi/2094846007.pdf
    • http://tekisinasapev.epizy.com/vidas_secas_filme_completo_youtube.pdf
    • https://s3.amazonaws.com/ragejufa/how_to_mail_a_package_from_home.pdf
    • http://rorewoj.rf.gd/tejidomifa.pdf
    • http://befokube.rf.gd/towujerip.pdf
    • https://s3.amazonaws.com/napoledunadigo/jakidirigebaduwulix.pdf
    • http://pokezuturev.rf.gd/bofogefilezam.pdf
    • https://s3.amazonaws.com/serogajugomiji/retap.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dfe.bin
3f965494d1f57ed79e57278dc51ec18633fa2c77729fb09edc0646dcc3139a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 5104 bytes
font_01_sfnt_off00012f2c.bin
f5b7517e0fb28927f6a79913b9dad30b1b3fd8f9d4484b899ce713cff9fa79cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2C 15176 bytes
font_02_sfnt_off00016038.bin
f53160ae1e27f28dba4e46cbb69aa7bd11f00c8f0a61c4b1794c691043580245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16038 16120 bytes

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