Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78a5b14df4ea955…

MALICIOUS

PDF

83.7 KB Created: 2021-03-18 02:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d85e5def5d09f6454a4007fa78c2edce SHA-1: 96c68fccc60c0f7490cbacd8d0f469e423ccbefa SHA-256: a78a5b14df4ea95551a15c823beaa4980a7d87bb8f467550e74133746f0e1d22
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://dafemum.ru/strik?utm_term=echo+srm-2100+fuel+line+diagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495707/normal_6005dda720f7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_604b6c545ad49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_5fd6004f4a31b.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/gusosesaxalapivivefufas.pdfIn PDF document text
    • http://xafomona.mypressonline.com/genetics_multiple_choice_questions.pdfIn PDF document text
    • http://wanezus.scienceontheweb.net/55610498126.pdfIn PDF document text
    • http://dayzcommunity.info/69008929974qfvs4.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/Uijj1Of/rutarubewobofipuj.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/bGZiitn/siren_head_sound_meme_button_siren_simulator_game.pdfIn PDF document text
    • http://idealica-columbia.site/2005_jeep_grand_cherokee_limited_radio_not_workinghy8xt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449172/normal_5fddf75de5e5f.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/0jdNjbD/jesewejag.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/ja2cgcl/keroluxusugakabowixozoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486743/normal_5feb1dd47d8db.pdfIn PDF document text
    • http://wukimokoled.iblogger.org/bubblegum_sans_pro_font_free.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/52416471069.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/xaraxixogozorel.pdfIn PDF document text
    • http://spencermcman.us/16569809521vhgcs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakapenabu.atwebpages.com/most_accurate_english_translation_of_the_quran.pdfIn PDF document text
    • http://dalonirutufitad.rf.gd/bahamas_heavy_font.pdfIn PDF document text
    • http://duvojawakupo.rf.gd/kmspico_win_7_activator.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/best_medical_school_personal_statement_examples.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_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 5752 bytes
SHA-256: 2979bfe0e81789019ab788c3607d78c6885565ad0e3342201044fc7493fe09a0
font_01_sfnt_off00011a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 11608 bytes
SHA-256: 32ba63a0ad2e58ff5c6523222cefd549ecd5a4fdc80bf6fae2174e70f7e6eac3

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