Malicious PDF — malware analysis report

Static analysis result for SHA-256 895d615035a22d03…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 17:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 578169018224f1fe337815f8cd15cb18 SHA-1: 647af22858a0479a8afa41005d491f2531609af8 SHA-256: 895d615035a22d036c2082d287427c76392e32e45b11dbaf1047814bb4d22683
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an intent to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this is a link farm designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=yo+anime+apk PDF link annotation
    • https://andana.us/files/files/suzaxon.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/getaz.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/74444198083.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/pipifosok.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lf6diruh7q052q04lvsnh3gbm5/toxukepevel.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/pipajizelabipugatisuxuwaz.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/17478826664.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/purigokinufig.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/75395466674.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/38722909284.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6e55ecc3---99054759804.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/kuvuzodowu.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/gewoxekalomexadizutuge.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/gisadaxogunufazidiw.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/zazibevofud.pdfIn PDF document text
    • https://tl-systems.hu/files/files/80539667953.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/sujodulipigedelupidujaj.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/fofefeluzepunupedagigi.pdfIn PDF document text
    • http://texmet.pl/userimages/file/4097293909.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/51783254251.pdfIn PDF document text
    • https://kimcert.org/E/file/suburudafiduv.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/jodufukitarixali.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/namojuzekokepegenafenerob.pdfIn PDF document text
    • http://kaies.cn/upfiles/210907070224508343i799gg.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/53588122797.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://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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 18508 bytes
SHA-256: 2f75a077582ff61539578b06912d3a4765f9ff92dd3c2c7929be3d59aaf2efbf
font_01_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 10076 bytes
SHA-256: a00ec3be70eaa57592fbcc768ff3a356ddfd284c65659cf1b58291e39eedd4b1

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