Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54b9e248bf1b144…

MALICIOUS

PDF

73.7 KB Created: 2021-09-28 08:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f5f9e441730ec4988c448b4bdb7e3de SHA-1: cc41d1099d5c4c633fb406087d29a58d4c1ef443 SHA-256: c54b9e248bf1b144090f5ac843a9d04a0eb47b451eeeff92db6ad766de18a33a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. The document contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting an attempt to lure users to external sites. The presence of a link farm heuristic indicates a high volume of outbound links, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://speckletrack.com/update/editor/file/87892562123.pdf
    • http://jiuxingchaoshi.com/uploads/file/011653328092.pdf
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/88017342406.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/97592160883.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/24799218469.pdf
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/43923068896.pdf
    • https://lompatjauh.com/contents/files/sefesuperorovuvosa.pdf
    • https://nordavril.com/userfiles/file/xexisefasilu.pdf
    • https://luminex.pl/upload/file/pudujojuwosofasaboline.pdf
    • http://wiskind.com/filespath/files/20210904030502.pdf
    • https://castel.ro/userfiles/file/95321941073.pdf
    • https://jf-orvalho.pt/userfiles/file/saxajasu.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/aa055a13463835bf82660ad7a8588b23/7068544854.pdf
    • https://osikovo.eu/webroot/img/content/files/zidedunezokozuf.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/imj3t6ktg56pg5km8eh0or749d/xenuzizigalifi.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/16961767419.pdf
    • http://madmojo.com/fckupload/file/wimumotivavigip.pdf
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/tixisesipadomirimijoregak.pdf
    • https://nhatthiengroup.com/files/uploaded/files/4004322535.pdf
    • https://locoffice.ru/userfiles/file/salagomepawijazufamimog.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/52632600356.pdf
    • http://leaguengn.com/userfiles/file///79409397338.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=el+emperador+de+todos+los+males+pdf
    • 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_off0000b8ab.bin
d63a8bcd15871844193c0e2986f349ddc58d239efd0abd83c973e1e69bdf4fc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AB 10448 bytes
font_01_sfnt_off0000d05e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD05E 16792 bytes
font_02_sfnt_off0000e870.bin
7eae6e32a1ca00f2846adb3e6a0c58ca7d2f076e597280bd57916fed3d867853
pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 19096 bytes