Malicious PDF — malware analysis report

Static analysis result for SHA-256 57edb77b17534e02…

MALICIOUS

PDF

71.3 KB Created: 2021-04-02 12:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e843151ac499640e41f7cc9bf0bd7484 SHA-1: 1f72397c55bf6fc8ceecdae41e0aab959f11d339 SHA-256: 57edb77b17534e02e1d928b81b538ea33f6ab4121f5a78ed616211ee797b83b3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and a phishing/malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'stoichiometry review sheet answers', aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=stoichiometry+review+sheet+answers PDF link annotation
    • http://vutisonoj.sportsontheweb.net/85969744767.pdfIn PDF document text
    • http://technodom11.com/how_to_start_a_venture_crewvw8l8.pdfIn PDF document text
    • http://wordsidepost.top/pawaxofuwivovamel6pjr.pdfIn PDF document text
    • http://vvinorama.fun/bileketakododalamiwifi4g6fd.pdfIn PDF document text
    • http://antonio-ita.space/kaiser_permanente_login_careersi8l6p.pdfIn PDF document text
    • http://xalowazejadiv.getenjoyment.net/dujibenumebituveda.pdfIn PDF document text
    • http://about-central.com/14938293512jtzqg.pdfIn PDF document text
    • http://vavazexowupex.medianewsonline.com/lonely_planet_egyptian_arabic_phrasebook_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/hNkggCn/24632451647.pdfIn PDF document text
    • http://bogavevi.22web.org/concierto_de_aranjuez_sheet_music_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/hjgnjb8/jadodazezabesopasuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/kowukogifaw/bjNVHh3/80319123750.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/1VpqY7b/pixel_royale_unknown_battle_ground.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mekazejirorarad.epizy.com/dujijarowapazogolowotude.pdfIn PDF document text
    • http://zojasofox.epizy.com/wamuj.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/49650734656.pdfIn PDF document text
    • http://vekisofekibote.myartsonline.com/best_shows_like_sharp_objects.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/the_last_lecture_by_randy_pausch_video_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/vuxovawewifikolunoput.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 5364 bytes
SHA-256: 62d315d7aa688e40d74a96d761498b0c46844dda76834635e4eb6651ab938b9a
font_01_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 10644 bytes
SHA-256: d380937b0a5ff2874165c929d5cffbffe787bd9611f347bacc3012eda2680d72

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