Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99840fe2e466d4e…

MALICIOUS

PDF

73.9 KB Created: 2021-03-31 11:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 19bbfcf452fb7893f7ca1776899c03d1 SHA-1: ce15eeca7e4e63aad200d0a7167a6a75b8aafeaf SHA-256: a99840fe2e466d4ee667ee404b6ca655b7250f5c94e67572f61324713dd42a0c
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body and embedded URI heuristics point to an attempt to redirect users to external websites, likely for further exploitation or credential harvesting. The presence of multiple external links and the use of disposable hosting suggest a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=applied+chemistry+book+for+diploma+pdf PDF link annotation
    • https://cdn.sqhk.co/zidodovare/1hffgcq/stunt_drivers_in_fast_and_furious_7.pdfIn PDF document text
    • http://mynasert.online/71073234062db7aa.pdfIn PDF document text
    • http://xijonope.iblogger.org/85449225097.pdfIn PDF document text
    • http://itdomen.fun/29916351129kqnte.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/fiegfSS/voice_recorder_free_high_quality_audio_recorder.pdfIn PDF document text
    • http://epaytds.xyz/what_is_another_word_for_lethargyl2a8q.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/oRghgij/sikepoxozinugelalilovunas.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/1Pjaihz/slayer_best_songs_list.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/CtB3ghd/60048404777.pdfIn PDF document text
    • http://smartbright.club/marty_robbins_big_irong0fpu.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/9BMV5tD/zuzevosetisukedupolowaril.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://maretubozewugi.myartsonline.com/38552729657.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_35f40843ba3e46158d5938060ae88629.pdf?index=trueIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_61722b17702a48c286045718f1e196fe.pdf?index=trueIn PDF document text
    • http://dufowuburaji.rf.gd/99839758208.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_773d664db2e74732a108bb6296574555.pdf?index=trueIn PDF document text
    • http://xafepabofi.epizy.com/messenger_video_call_filters.pdfIn PDF document text
    • http://mibaxeruwo.epizy.com/english_presentation_script.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_5da250c98b554d33a248db8d8553e669.pdf?index=trueIn PDF document text
    • http://rorokepu.atwebpages.com/31635475550.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 5372 bytes
SHA-256: 78f25d5976fa0da34083d0822cb094b5fd1a9a4560a06ae1eed7cfcea781c3db
font_01_sfnt_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 10888 bytes
SHA-256: 2fa235ba219aeb5fcb5db330d669ccbc49df3a49ab220d7d928e4b0b7fc7bdee
font_02_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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