Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ce6f0ca097e044…

MALICIOUS

PDF

78.7 KB Created: 2021-03-16 15:11:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b192ccc26331d5057466c611e21ea770 SHA-1: be615f76f89413ae6473a8b6cd59e7d55e477f43 SHA-256: 39ce6f0ca097e04446d64a044d5355c2bd06f75c14417c8e4c05a3de98647796
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mezovuduw.ru/strik?utm_term=ign+game+releases PDF link annotation
    • http://tixesikixux.mygamesonline.org/mcgraw_hill_connect_customer_service_number.pdfIn PDF document text
    • http://sk-anker.ru/97973294896zm8zj.pdfIn PDF document text
    • http://trells.space/how_to_weld_beginners4tjsg.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/2018_subaru_forester_xt_limited_reviewi2hhi.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/gcMuhiv/video_app_for_macbook_air.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/iKgevji/alia_bhatt_star_life_mod.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/zabareloxidibotagajozus.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/17105008639.pdfIn PDF document text
    • http://lowwsaw.xyz/fovojomabawakunemhrpce.pdfIn PDF document text
    • http://trickyturkey.com/what_does_lucida_meanto5mg.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/7EatC9R/85376496627.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/8974565307.pdfIn PDF document text
    • http://milanbeach.fun/how_to_update_ti_84_graphing_calculator8hhgb.pdfIn PDF document text
    • http://soponakox.22web.org/fuxewuwudim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kovuzamizin.rf.gd/medurosotabikimibasepod.pdfIn PDF document text
    • http://wovibojo.onlinewebshop.net/why_do_babies_get_fussy_during_leaps.pdfIn PDF document text
    • http://monozalimixa.rf.gd/7_little_words_free_puzzle_playground_answers.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/physics_for_class_9_sindh_textbook_board_download.pdfIn PDF document text
    • http://soxuxemakim.rf.gd/52385685606.pdfIn 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_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 4944 bytes
SHA-256: d4d49977de8edd9e33ebae91ed3dad241c31c7de1eb31c44146c4b5408fb7aa7
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 11300 bytes
SHA-256: b36668a7bc84f872af921560d8e96c6d3e1e420a65025959856c087890e99aee

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