Malicious PDF — malware analysis report

Static analysis result for SHA-256 064e0c70170e4933…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 20:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6bd4880464d36dd889734f6fcd41dd7f SHA-1: 46584d616d5f55938936f4b6fced51cd0e0c9ebf SHA-256: 064e0c70170e49332ce3bcdd5db77ab447d35b802d8c97d2a4a456220530cc36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files on distinct domains, suggesting a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, likely to evade detection or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://anpo.vn/upload/files/dugud.pdf In PDF document text
    • https://groupburuemas1.com/contents/files/7473507950.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/resuwo.pdfIn PDF document text
    • https://kratky.eu/files/file/nirob.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/begokiviputasufixixev.pdfIn PDF document text
    • https://mkontroll.hu/File/nutazuwerebanogilonepilum.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/setitogabofejufi.pdfIn PDF document text
    • https://tpk-m.ru/files/file/kalifibog.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c17b67aa61---xulabikopazowitebarul.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/nelixoxiwivosupi.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/bemovepovisiwenegeja.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/59161637742.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/juxokezosonurokajitaw.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/60584078207.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/39623416418.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/27981197505.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/5840069631.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/bokevijazet.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/kizeridesugo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xonixakibameraxak.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/bifapomepewaviripe.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/mujobezavejevogalu.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/wafidusanalavadefav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=chrono+cross+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 20020 bytes
SHA-256: 3eee9ab294e71c254b89b66f5c7e9f155e121bafedda801de576e901b1d47f9d
font_01_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 10228 bytes
SHA-256: e52b127057a8b6b8933d0c2c09ca7cf031b47860276cb2d27feb237fa7859c25

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