Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06a0bd91eb5c690…

MALICIOUS

PDF

75.4 KB Created: 2021-02-18 14:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1805fce07f5b9aabe7b2768949edebc9 SHA-1: 2c87422608875d57414d3969670927ffe6cd7fbf SHA-256: c06a0bd91eb5c690f599ed1ba5575ceb3994e5f900344f230c745512925c92d6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though partially garbled, suggests a lure related to 'social studies' to entice users to click the malicious links.

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://jottigo.ru/strik?utm_term=what+topics+are+covered+in+social+studies PDF link annotation
    • https://cdn.sqhk.co/pobusafi/TDfjsGA/10811608929.pdfIn PDF document text
    • http://nadahul.ru/300_best_canadian_bread_machine_recipespxf2v.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/piZhghf/jodaviwajulekadakerol.pdfIn PDF document text
    • https://cdn.sqhk.co/kixituvelil/ibvichf/pajepovaxemuda.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/bAjjPJh/color_splash_pool_light_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gipagigo/b2kjiZ3/67084062760.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/haldznX/gopivaderesar.pdfIn PDF document text
    • http://mailedflkf.site/7904151288ualsm.pdfIn PDF document text
    • http://gachihyper.xyz/28847812119sdkmt.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/fjhe3jh/golden_boot_premier_league.pdfIn PDF document text
    • http://nout-prokat.website/zijadulupu6ke4x.pdfIn PDF document text
    • http://wonnaturila.space/english_to_hindi_kruti_dev_010_onlinenj2b2.pdfIn PDF document text
    • http://joblanc.xyz/dezakiziwebarxyqx4.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/yhgyggN/55141682975.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/lYGbgjE/81346584995.pdfIn PDF document text
    • http://lovemecompletely.com/562444352059uia3.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/hQjf8jj/alienware_usb_mouse_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://subedawulowuwo.epizy.com/undp_egypt_human_development_report.pdfIn PDF document text
    • http://puzasapexuwuju.epizy.com/naruto_senki_mod_semua_anime.pdfIn PDF document text
    • http://rifukaleriduji.rf.gd/igcse_maths_syllabus_2020.pdfIn PDF document text
    • http://josatagosovux.rf.gd/87638853171.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_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 5232 bytes
SHA-256: 7d826f5705345b242c0019b5b22baa4b8d0e098be8d8c31650c6dc6596061c87
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 11560 bytes
SHA-256: 0de2e5b08d06361715df8d38a5ac55455b295250854afd462a2308502abb92d0

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