Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2161700f812184…

MALICIOUS

PDF

68.9 KB Created: 2021-09-20 00:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 472fe602098ca020b844f46e372353b9 SHA-1: 50e9638800f39ead3bdb1ab1ff0ff75d598700fd SHA-256: 6b2161700f812184bbcc6928d23c55d866d1b24adf66aa2854a52d0d9f628eed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and the link farm heuristic indicate a pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=doom+n64+rom
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofiko.pdf
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/22907480536.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/luvotu.pdf
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/jebosejuxavuvelabobigi.pdf
    • https://kawanmto.net/contents/files/wajumutimibobi.pdf
    • http://abc-tel.ru/data/File/68163797543.pdf
    • http://shipagents.nl/uploadfiles/file/89130629703.pdf
    • https://mongolia-volkslift.com/uploads/files/89550995785.pdf
    • http://mobiliteit.nu/files/burabuwanakuli.pdf
    • http://oskarmak.com/userfiles/file/18644966095.pdf
    • http://solarissoft.com/img/userfiles/files/47660378006.pdf
    • https://wfca-czech.cz/temp/userfiles/files/20480254652.pdf
    • https://people11people.com/uploads/File/7429595443.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/gedonafagizuri.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7c44715af4ee28c9c6911bdd473f8221/gogejisejalonademexuvujan.pdf
    • http://nfrostov.ru/upload/files/91717145780.pdf
    • http://kengosushionlineorder.com/uploads/files/gapobalikizixuk.pdf
    • https://renault-service.com/userfiles/3457167563.pdf
    • http://themetamorphoseprogram.com/userfiles/file/46589103573.pdf
    • https://panificioilcavaliere.it/userfiles/files/44294724105.pdf
    • http://narnivet.com/userfiles/files/94679789959.pdf
    • http://nincity.de/inline/file/viduba.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140e72ad7008---suveduzuvuxomobuvaguf.pdf
    • https://inprovitparaguay.com/ckfinder/userfiles/files/88688077132.pdf
    • http://www.tahi.hu/ckfinder/userfiles/files/95847727571.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_off0000b05b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 16792 bytes
font_01_sfnt_off0000c86d.bin
2ddb5a69172401ce0e468db6adbd774981b4fec800853e56a677abcf466ad5e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 15564 bytes
font_02_sfnt_off0000efb1.bin
25c1dfdf02d1461360e0a6f8f61635afa5c1376357c31900161e4ee6dcc33e86
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 9816 bytes