Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4e2b344a25747e…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 13:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a58f54fb493ec47540a4fe1f90d9a43 SHA-1: c7f47f681f6333c7222b4e4a8f8223a5e4c72fae SHA-256: 7d4e2b344a25747e7856a564056d4156680602129cf3031e7a267745449e4c2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern focused on redirecting users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://packagingandfoodmachinary.com/userfiles/file/23040399943.pdf
    • http://luisacortesearchitetto.it/userfiles/files/befimibubupedozabajev.pdf
    • http://mistral-paints.cz/userfiles/files/1895265223.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/dojezejotanoruva.pdf
    • http://keralastatetailorsassociation.com/userfiles/file/bimigupolet.pdf
    • https://jjcfurnituremaker.com/userfiles/files/renerukovamaxasazilonuzu.pdf
    • http://merlegdoktor.hu/tmp/99364644033.pdf
    • http://dental-forum.ru/userfiles/file/kozesuxamesodaboxebugoje.pdf
    • http://cuacongtudongbinhduong.com/upload/files/kifadilevaposoronixexikak.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/xuxunakoligeruxemesutif.pdf
    • http://aktifbant.com/resimler/files/50758111692.pdf
    • http://laserinnsbruck.com/static/davunavujojesoxorodakib.pdf
    • https://castilloexterior.es/ckfinder/userfiles/files/mipesubazagidijop.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/46683242297.pdf
    • https://www.sterlingsez.com/ckfinder/userfiles/files/nafezakifuwibozodevegop.pdf
    • http://osingenieria.com/images/admin/file/muvotigut.pdf
    • http://eptesteplelek.com/uploads/file/sudazubeki.pdf
    • https://protum.se/file/44141057489.pdf
    • http://biolabsrl.org/userfiles/files/60900705801.pdf
    • http://vladjurnalist.ru/archive/file/53419075031.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/463697537043ca49be608546bd1e32b7/reworudagavotinoti.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/73547451425.pdf
    • https://zenithoverseas.com/assets/userfiles/files/gitolalowof.pdf
    • http://hennel.hu/sources/elemek/file/xozowoton.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=grand+theft+auto+for+android+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d892.bin
126827dd5e160e38b3cc4304945aefd2365ac30378fc8ad65b42eb099ebd3f1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 10612 bytes
font_01_sfnt_off0000f0bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 16792 bytes
font_02_sfnt_off000108d1.bin
a204c636917a1ace099e57eb32bb69363c808cb469994cf0900a4a796637a49c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 18348 bytes

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