Malicious PDF — malware analysis report

Static analysis result for SHA-256 102bc45a6d9bd629…

MALICIOUS

PDF

86.6 KB Created: 2021-02-27 19:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 461b4a80a4d6d0021e74a19d3ba280cc SHA-1: 43d0e8f58b61a2bd2fe6a84cfddda59583e93a61 SHA-256: 102bc45a6d9bd62973e4d667afb09d94992c2f58861420d3fa03911390887107
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a book summary, likely to trick users into clicking the 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://dugedepap.ru/123?utm_term=percy+jackson+the+lightning+thief+summary+chapter+18 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384048/normal_600c0c5835df7.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/nationalism_in_india_by_tagore_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/gdihie5/vilux.pdfIn PDF document text
    • http://subonus.ru/natural_born_heroes_book113ho.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/27466523440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_601189ae97784.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/1pEgjjh/badminton_league_game_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496828/normal_5fe6c8a4c325e.pdfIn PDF document text
    • https://cdn.sqhk.co/soredepel/jcjeUKJ/modern_combat_4_zero_hour_mod_apk_revdl.pdfIn PDF document text
    • http://argo-tourism.com/noxatiw9gi1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_600314ec46c64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5fe85fc22cb23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/3000227564.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/women_warriors_of_india.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/strongs_concordance_2222.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_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 5916 bytes
SHA-256: c038a450d1e0225e7cc60d4826eb4188ad654d53d68515fc01f161d4d4667c98
font_01_sfnt_off00012a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 10104 bytes
SHA-256: 370e3401921993a19a8c5c07c451acaa21e7b9f756c73bce28b564efc009364f

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