Malicious PDF — malware analysis report

Static analysis result for SHA-256 f230fa9bfaa1e8c5…

MALICIOUS

PDF

66.7 KB Created: 2021-06-06 20:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da431ac26162ebc1567aedbeee1d9fbb SHA-1: b2d7672bfdcd11758a0442b5b77c5e17c0a6a0eb SHA-256: f230fa9bfaa1e8c5a1b6de31dffdfd1e50a8be9dd5e97d0b9c8ddeed73c80dbf
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a disposable domain, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a product manual, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/pbw?utm_term=deerma+f600+english+manual
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/gokarofura_redeji.pdf
    • https://mepaxekedin.weebly.com/uploads/1/3/4/5/134514716/bafab.pdf
    • https://jujamepusa.weebly.com/uploads/1/3/2/8/132815903/punebijenekawi_fogopopul_jibalukumifiva_waramad.pdf
    • https://vusubidasezojix.weebly.com/uploads/1/3/5/3/135399418/zufepuva_varaliwa_kojiro.pdf
    • https://petomikerip.weebly.com/uploads/1/3/2/3/132303099/9120427.pdf
    • https://tupalewituto.weebly.com/uploads/1/3/2/6/132682563/1432315.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wixumip.pbworks.com/w/file/fetch/144685089/xunufunuluzawa.pdf
    • https://uploads.strikinglycdn.com/files/4e52c251-58cc-4fbd-ba11-bd221765c746/craftsman_garage_door_opener_keypad.pdf
    • http://lakebimutep.pbworks.com/w/file/fetch/144418044/57230635203.pdf
    • http://namebitepu.pbworks.com/w/file/fetch/144713478/borugufikafutejesere.pdf
    • http://rukutuxeriro.pbworks.com/w/file/fetch/144554406/2-4_practice_form_g_deductive_reasoning.pdf
    • https://uploads.strikinglycdn.com/files/f39c9739-d97a-4bd5-9470-dcc561e8e1ab/new_swiffer_wet_jet_wont_spray.pdf
    • http://zewalar.pbworks.com/f/how_to_collect_dragon_bones_rlcraft.pdf
    • http://botinuba.pbworks.com/w/file/fetch/144414594/tijenadekufekijiv.pdf
    • http://fosirodovo.pbworks.com/f/download_game_kick_the_buddy_forever_mod_apk.pdf
    • http://zikupuzajix.pbworks.com/w/file/fetch/144450528/anime_all_stars_mugen_apk.pdf
    • http://werinenimuta.pbworks.com/f/how_to_connect_afterglow_wireless_headset_to_pc.pdf
    • http://laxaxufudej.pbworks.com/f/quando_prendere_magnesio_mattina_o_sera.pdf
    • http://zekodunu.pbworks.com/w/file/fetch/144606402/how_to_do_a_figure_drawing.pdf
    • http://fotikeralo.pbworks.com/w/file/fetch/144612867/the_land_of_open_graves_introduction_summary.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_off0000c87b.bin
592998409b9566736b4cb8d52c4ecd2a69f40a9e7da7ec48aabb921b9a02c8a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC87B 5476 bytes
font_01_sfnt_off0000daec.bin
24250ce2516d0540c34edb779561d47b5841e0b9eaf49aec9d6ad0760f538311		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 10496 bytes

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