Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b39b31cb663cc36…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 18:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de20d67c2a1debf8ba9797485bdfe73d SHA-1: 55b75a661968611b70ac2597399e5f9d5cdde76e SHA-256: 3b39b31cb663cc3610c97ef9594996ca7aa43954b6015122d14fd397b8d40286
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The primary attack pattern involves luring users to these external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://shiny-baby.com/fileimage/file/36027116549.pdf
    • https://pasarangroup2.com/contents/files/tizuzoso.pdf
    • http://medi-sen.com/files/files/kosamij.pdf
    • http://scandinavia-ex.com/images/blog/file/36798759417.pdf
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/38136594739.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/64542216319.pdf
    • http://duszek-lasu.pl/userfiles/file/96490687106.pdf
    • https://deltarents.com/upload/ckfinder/files/xizuto.pdf
    • https://absoluteanytime.com/media_file/files/files/96391312800.pdf
    • https://mehreganimaging.ir/images/upload/files/92696902698.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161301e5b84052---53604282708.pdf
    • http://yuhenganquan.com/userfiles/file/20210924010447_2046544453.pdf
    • http://maraulsan.com/ckfinder/userfiles/files/13536370150.pdf
    • http://hingliltd.com/userfiles/vijunaludozugazukib.pdf
    • http://domgr11.ru/uploads/files/32297362237.pdf
    • http://ensky-chemical.com/upload/files/sinegifukavawatiginijiwuf.pdf
    • http://pedraferro.com/files/files/94520543989.pdf
    • https://giga-tronics.com/userfiles/files/44254252714.pdf
    • http://monteconsultants.com/image/upload/File/tixuvuvapapuxowez.pdf
    • http://elitsatodorova.com/uploadfiles/file/maxivud.pdf
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/84033219527.pdf
    • http://thenikharvconsultancy.com/userfiles/file/21400824703.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=shivaji+surathkal+full+movie+watch+online+123movies
    • 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_off0000ac3a.bin
4dda1cb652dc44039e44579089729e68917c4ade8532cafa0406b6dbcf76cb06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3A 11496 bytes
font_01_sfnt_off0000c768.bin
fdb384be80f1cfec5e773cae130810640ce741b8a33f7cf549ae839ca50fa3ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC768 15096 bytes
font_02_sfnt_off0000ed8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 16792 bytes

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