Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a991421341ba8e…

MALICIOUS

PDF

79.2 KB Created: 2021-03-17 12:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 21ab3f4e4cfecc16266956277b5dcc3d SHA-1: b2a78f09700899c2d34a1b445aec7dee68d81287 SHA-256: d8a991421341ba8ea441f4c074963f7f3ead6f7c14001e3db3a228304442a02b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to service manuals, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=bobcat+753+service+manual+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391915/normal_5fc6e018b9972.pdfIn PDF document text
    • http://shortsomfj.space/applied_informatics_software_engineering_gmbh2169b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5feb195978285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff667a735006.pdfIn PDF document text
    • https://cdn.sqhk.co/lomotutuwe/d6heBh6/kill_ants_outside_naturally.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467936/normal_5fd10e4a7a817.pdfIn PDF document text
    • http://peuly.xyz/control_systems_engineering_course32kf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402261/normal_5ff580516b3f6.pdfIn PDF document text
    • https://cdn.sqhk.co/napefabet/9gdMFbn/marsha_blackburn_younger_years.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/jghhijg/torrent_torrent_downloader_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://latevafizatum.rf.gd/semuvale.pdfIn PDF document text
    • http://papipafikumi.epizy.com/chest_guidelines_superficial_thrombosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842d38b4-1f4c-4a01-a1c4-d2e13df0dbd1/jovujalojajaziki.pdfIn PDF document text
    • http://xawabaxazulaga.epizy.com/vande_mataram_dj_song_original.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e00e878-2d46-4a5a-940a-f254f0f72be2/bobcat_s650_code_m1806.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_f40f70a9c0af423b9aba9c9eab5cb96f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb89249e-2f5c-46e0-aa1e-814170547a51/43017661772.pdfIn PDF document text
    • http://monuwuwotivonil.epizy.com/6th_grade_vocabulary.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_07189d45a3dd45c898fb2660bbde8e32.pdf?index=trueIn PDF document text
    • http://pedorusare.epizy.com/81875405461.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_c8f9bbc85dca486893dd27b706ed0d60.pdf?index=trueIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_aec871c10cdb45f8b6d5440849ce03ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6813c75-84c5-417c-a937-9673a6e4d203/92598133953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf9699a-9253-48e5-8a71-a76c04587c91/supply_chain_management_entry_level_jobs_toronto.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_021a32fcd88d4dbb9140bdd7ce8afdd1.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 5876 bytes
SHA-256: 9fda736d4a700b1266eec06d6e174e343a93c3e082c384ebfd763b81321d51a9
font_01_sfnt_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 11112 bytes
SHA-256: 81f8963a3a9e51c05f4903e25ee8d36565303c56bf89752905522e88a16e2c3c