Malicious PDF — malware analysis report

Static analysis result for SHA-256 5faaf2b8509694ea…

MALICIOUS

PDF

74.6 KB Created: 2021-09-09 04:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e069189bc9f32d4eaf21a606ce60109 SHA-1: 957ecc717ca4915b71d986dce1cb3dd42f192fc1 SHA-256: 5faaf2b8509694eafb8694a1c12eeafae5741df6485f95d9908ca1ec2531d45d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or SEO poisoning attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern of using disposable hosting and link farms. While no scripts were directly extracted, the nature of the embedded URLs suggests a potential for further malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fullprotec.com/ckfinder/userfiles/files/92660559730.pdf
    • http://oasis-inwaste.asia/files/file/11228452980.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/oefqil12216oclbiq60spped0c/jesifasanoz.pdf
    • https://playerpress.com/ckfinder/userfiles/files/datoxetewuteverasapakogu.pdf
    • http://haiannweb.com/uploads/files/vulomexizefodopagaraj.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/zatudutit.pdf
    • https://ceylanotel.com/firma/files/91515440815.pdf
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/vabaxuzamepudaki.pdf
    • https://upaspor.com/resimler/files/21852624292.pdf
    • https://mtestbd.com/assets/uploads/files/34036954046.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/87428415608.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161393d5a5633c---jivowamodejivabe.pdf
    • https://investincarpathians.eu/app/webroot/media/files/jekujezodajigijenu.pdf
    • http://essentielles-theater.de/UserFiles/File/gikigeletemupuwukelex.pdf
    • http://krukaiart.com/userfiles/files/34945408799.pdf
    • https://lyna-garage.com/htdocs/cljr/data/files/77526419238.pdf
    • http://www.awakohchang.com/image/upload/File/1561746605.pdf
    • https://viettincapital.vn/upload/files/sejolejiregifava.pdf
    • http://asbu.net/uploads/FCK_files/file/mebikidiwosirutumirigexag.pdf
    • https://malabarmail.com/ckfinder/userfiles/files/mesuguli.pdf
    • http://self119.net/upload/userfiles/2021/09/files/210905004258.pdf
    • https://thebookonpersonaltransformation.com/FCKeditor/file/77347648610.pdf
    • http://digilit.ir/basefile/digilitir/files/tugixifegirewidusitix.pdf
    • http://motolargo.pl/userfiles/file/89521271811.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=nerf+mod+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_off0000c12b.bin
53e022d35404e9b75ea80d91af77bdb2ab2c3fb722994490a3ad7d7608061048		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC12B 10220 bytes
font_01_sfnt_off0000d818.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 16792 bytes
font_02_sfnt_off0000f02a.bin
d40853dabf299d8277b440f2342343071ffccb597add79f0b1b0b21aa3f19831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 17244 bytes

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