Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1645d8ac38dcfa…

MALICIOUS

PDF

79.0 KB Created: 2021-04-02 14:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b4eb5275a39120c1c0310368a1dfc456 SHA-1: d4032d2b31326157ac2fde27e9d5e19baaa96f70 SHA-256: dc1645d8ac38dcfab16933defd2b30a5abd73704dd876879042a1f232cd8d159
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting a link farm or redirection to malicious content. The document body, though heavily obfuscated, appears to be a lure related to technical topics to mask the malicious intent of directing users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=cantilever+retaining+wall+solved+problems+pdf PDF link annotation
    • http://kprovk.xyz/brain_games_tv_show_full_episodesszatf.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/jgidUmn/eatme._io_hungry_fish_fun_game.pdfIn PDF document text
    • http://generalmassage.online/xowubokugatuzeketidokos4yys9.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/bX2xjjl/wofudekupobolipilopav.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/ihvmGif/tufuferoziroko.pdfIn PDF document text
    • https://cdn.sqhk.co/vifamepupib/GLigK8x/97647498408.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/hijhPge/picture_editor_for_windows_8_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/manizamo/geiergc/crib_mattress_bed_sheets.pdfIn PDF document text
    • http://wofoweniwer.iblogger.org/gimigorukeruxowabus.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/SjixjbW/lego_jurassic_world_dilophosaurus_code_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bulujono/challenging_math_brain_teasers_with_answers.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/learn_english_for_beginners_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19148a51-55cb-4dde-9958-caed36ae8d71/fallout_4_mods_without_bethesda.net.pdfIn PDF document text
    • http://rezumasalimod.epizy.com/casino_royale_1967_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/348349c8-3ba4-4545-acae-ddfbf721bd3b/84027273749.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/dokofupapozijelu.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/how_to_reset_a_netgear_switch.pdfIn PDF document text
    • http://virixavop.epizy.com/10871190246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c094117-3936-477b-a728-b5bbc631656d/can_you_day_trade_futures_without_25k.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/rozadev.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_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 5556 bytes
SHA-256: 9335252de6555dcd93423f42b03db0529d915e866836ec08b804e51e0a1d96c4
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 11604 bytes
SHA-256: 777460ac9bb8e6af544d08e894bb8fb0844e86b66cf950cda91e37af40171ea2

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