Malicious PDF — malware analysis report

Static analysis result for SHA-256 161f90a4b64cffae…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 20:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb2f41aa95c35cf8aa6bf4231fc17f81 SHA-1: 29de0080b9e1a792351f2b19df73dc7112e4803c SHA-256: 161f90a4b64cffae85a8a69779ce36a3dfbaf332d0cf68831336f001145754fe
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URIs, with one pointing to a raw IP address, indicating a potential attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nirmalujjwal.com/public/ckfinder/userfiles/files/boxejopa.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/vitepuraj.pdf
    • http://logicamail.it/draft/media/xomala.pdf
    • https://kisikana.hr/userfiles/file/94723958700.pdf
    • https://big-affaires.com/img/pics/files/42296230227.pdf
    • http://niszczeniewaw.pl/userfiles/file/40019867669.pdf
    • http://letdentalab.com/img/files/lovidelomekoxojukodawub.pdf
    • https://seerupit.dk/assens/file/gevuwozarozaz.pdf
    • https://facades-et-traditions.com/actualites/file/muvanerenolanote.pdf
    • http://shopcode.ru/uploads/file/16845497332.pdf
    • https://www.sistemkabin.com/ckfinder/userfiles/files/xipavimipinexop.pdf
    • http://dongphat.net/upload/files/68240482336.pdf
    • http://185.33.116.145/~acus01/upload/files/sutasifemobalememo.pdf
    • https://posetili.ru/userfiles/file/20858933205.pdf
    • http://askaudit.ru/price/87558128634.pdf
    • https://ngonluathan.vn/images/ckeditor/files/75418932029.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210902_E8FA43172E135F87.pdf
    • http://xn--e42bt3l.net/upfile/files/58297084224.pdf
    • https://radekslodkiewicz.pl/files/file/fiwumabarewivaxu.pdf
    • http://ufcnagykanizsa.hu/userfiles/file/pebasizisurovalugitor.pdf
    • http://dglytbt.com/upfolder/e/files/20210904180017.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210907_1311CC4358F1254C.pdf
    • https://zenit-npk.ru/files/file/dubokominudivefe.pdf
    • http://familiegravesen.dk/userfiles/file/18335906781.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=diferen%C3%A7a+entre+gripe+e+resfriado+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_off0000bebb.bin
0d5b54d33e239522623f85e2eced3be336a1d6e17637edab2f4ea019f1967879		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBB 17748 bytes
font_01_sfnt_off0000ea3e.bin
55352697a95b2a3b22174c113ef6db7d79a0f473bc8b3bb9724e4878132e05c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 10828 bytes
font_02_sfnt_off00010327.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 16792 bytes

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