Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c97f512fa5ea621…

MALICIOUS

PDF

73.7 KB Created: 2021-10-02 11:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35bfb5f8b9c487e1cc7c19b2ea27e013 SHA-1: 1e32a10bd9adf83fefef997b6b19574ab93e2c63 SHA-256: 6c97f512fa5ea621ebd967a3c93d58f6fb72a87a271946571140edf8a7657755
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, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://zjleiou.com/images/upload/File/sigesenuni.pdf
    • http://bhk-aindling.de/userfiles/files/pelewunetelubi.pdf
    • https://eurotig.ro/file/76002359317.pdf
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/83720518202.pdf
    • http://autoscuolemontagna.it/userfiles/files/74606260778.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161350ebd57d56---denujadutulejigoverevobe.pdf
    • http://czpohledavky.cz/userfiles/files/lesixeramogomi.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/9673759221.pdf
    • https://nucamsa.es/userfiles/files/3682219841.pdf
    • https://jmtours.co/aym_image/files/wepufovegobutufusibiposa.pdf
    • https://fallahi-sch.com/userfiles/file/lavorovizololuditadesol.pdf
    • https://anctools.com/ckfinder/userfiles/files/98874309689.pdf
    • https://electroagro.es/pub/files/37716236423.pdf
    • https://ribaczpeter.hu/files/file/48768197764.pdf
    • https://repare-ton-smartphone.com/userfiles/file/59232700707.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3b146ed2ecba1a642134fbc0b3ad3bf8/92112361488.pdf
    • http://dsraxys.com/uploads/29844462834.pdf
    • https://nepalfinepashmina.com/userfiles/file/50594738966.pdf
    • http://shangrilayunnan.com/ckfinder/userfiles/files/lujavizi.pdf
    • http://kmsenior.org/file/files/79930841638.pdf
    • https://santa.sg/images/users/00000000/files/80944624741.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=you+better+not+cry+augusten+burroughs
    • 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_off0000bae9.bin
acd2bfa11a3b808281a901eed375f0f91704233ad901a5de423fc10c56a8b4c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE9 10708 bytes
font_01_sfnt_off0000d388.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 16792 bytes
font_02_sfnt_off0000eb9a.bin
ec09e95750f3a587f9f13e88d1617e6f3bc99583fcf1bed56ed27834d6df61a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 17740 bytes