Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cf3d8a8c3e1a2d…

MALICIOUS

PDF

85.1 KB Created: 2021-04-04 05:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: af5d1710e1b961e1c32e48ca34d0ab0a SHA-1: d95c7b6c7f3c62c0bc8627c97301b4d71cc864ae SHA-256: 23cf3d8a8c3e1a2d9d6f5c07c8cc5d415d1785765ca2c11c8a9cc45ac0ae0133
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection strategy to host malicious content. The document body, though heavily obfuscated, appears to be a lure related to academic problems.

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://botokaw.ru/123?utm_term=velocity+and+acceleration+problems+with+answers PDF link annotation
    • http://nebofimanigi.sportsontheweb.net/44798305614.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/9ae6f97fea9c79.pdfIn PDF document text
    • https://bonadamoge.weebly.com/uploads/1/3/4/0/134000068/vifosokovivaxolixex.pdfIn PDF document text
    • http://kafemefiturokuk.22web.org/acneiform_eruptions_corticosteroids.pdfIn PDF document text
    • https://cdn.sqhk.co/guwodirulik/gjeZrvE/steelhead_fishing_report_erie_pa.pdfIn PDF document text
    • http://suxulopiluv.22web.org/disilubidibenuv.pdfIn PDF document text
    • http://kadesevi.iblogger.org/boye_loom_set_patterns.pdfIn PDF document text
    • https://bajewenizuku.weebly.com/uploads/1/3/4/4/134475359/d0edb2549749.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/bOjijht/jozinalasewej.pdfIn PDF document text
    • https://lerogufoporix.weebly.com/uploads/1/3/4/8/134885840/8483491.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/adjective_verb_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiresigotapikeb.rf.gd/halloween_party_invitations_templates_word.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/curious_cat_pro_apk.pdfIn PDF document text
    • http://xamusewegelaru.rf.gd/8730708521.pdfIn PDF document text
    • http://tuparibuju.atwebpages.com/tukumojivipatet.pdfIn PDF document text
    • http://jizonizop.rf.gd/an_approach_to_audio_frequency_amplifier_design.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/50029963016.pdfIn PDF document text
    • http://xegubidutanaza.epizy.com/twice_fancy_violin_sheet_music.pdfIn PDF document text
    • http://midelex.epizy.com/south_elgin_il_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/61146652732.pdfIn PDF document text
    • http://fopekexu.epizy.com/my_maths_homework_book_answers_2c.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_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 5612 bytes
SHA-256: 6d9e29454cf1e664af8b4f55d69d0eec9d7a6ef0b787c3f9f1ecf74b07348adf
font_01_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 11196 bytes
SHA-256: d9f617b5fad92793e0ec77ce9aebe21e6d635c95ed3d16a78eaf12333214c95e

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