Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bc86d4023cb1b1…

MALICIOUS

PDF

71.6 KB Created: 2021-06-07 00:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 29f9f894ef77b6ea23016ea954167c47 SHA-1: d5a02ec6b5679e7d1c93ba646cdff6850bf8c3e6 SHA-256: 79bc86d4023cb1b109202447a28cfcb8dcd6b42ccd058200004c96b8af1658f9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The presence of a malicious ML classification and ClamAV detection strongly suggests malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=good+morning+bible+quotes+images PDF link annotation
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/1f550bf5a9a63fb.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/8663388.pdfIn PDF document text
    • https://kopiwuzurori.weebly.com/uploads/1/3/1/3/131398237/981913.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/9141551.pdfIn PDF document text
    • https://posuxosovovenev.weebly.com/uploads/1/3/4/5/134593520/vadiluk_sazenovakufow.pdfIn PDF document text
    • https://vekiruwubutut.weebly.com/uploads/1/3/1/0/131070393/vakomoxogobikezavo.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/9173714.pdfIn PDF document text
    • https://buneresax.weebly.com/uploads/1/3/4/4/134478328/6349355.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/kafevup.pdfIn PDF document text
    • https://botasapozav.weebly.com/uploads/1/3/1/6/131607984/4a5a402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxopal.pbworks.com/f/integrated_chinese_lesson_7_dialogue_2_workbook_answers.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/moultrie_game_camera_reset.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/como_descargar_familias_de_revit_2019.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144546405/traffic_rider_apk_day_hile_indir.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144702912/25065410808.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/f/53010291563.pdfIn PDF document text
    • http://nelivameg.pbworks.com/w/file/fetch/144750720/spin_halloween_lucky_wheel_to_win_quiz_answers.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/where_to_get_certificate_to_file_action.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144499590/61298358021.pdfIn PDF document text
    • http://mosijiv.pbworks.com/f/fizewiposijifigegene.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144577083/how_to_remove_stickers_from_telegram.pdfIn PDF document text
    • http://wotesova.pbworks.com/f/ignou_b.ed_admission_2021_eligibility.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/jubotuv.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/1448114741.pdfIn PDF document text
    • http://dipazuwawex.pbworks.com/w/file/fetch/144615516/jitotasidonuxi.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_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 5440 bytes
SHA-256: 896a27e93447009e0a77f0096be97a349f1756e6e216f5a259d9dedcc5c12b00
font_01_sfnt_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 10016 bytes
SHA-256: 1177431021ee4b5e892c55158e4bc59dcff9cb062de6ccbcf0a4fe266f3396b8