Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa580256f42e021…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 01:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8a24fa75b2952c72666ae1b7cfc1dc6 SHA-1: 68bb5cc75eb78a3dc7b1139892f1957fd1fd4e5d SHA-256: afa580256f42e0217525b1fbbabd6265990a6a0a85e334ae827ae5d5e2e39c2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to numerous external PDF files. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF's nature and the numerous external links point towards a T1566.001 (Spearphishing Attachment) vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://safaraval.com/basefile/safaravalcom/files/jajurukuvigaso.pdf
    • http://pescepiana.eu/userfiles/files/zedefasaf.pdf
    • https://thietbivesinhsonhoa.com/webroot/img/files/poselus.pdf
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/tadomese.pdf
    • http://creatinglifeoptions.com/userfiles/files/94032901965.pdf
    • https://ecoquimica.cl/dinamicos/uploads/file/80952709722.pdf
    • http://zamdq.com/filespath/files/20210913172013.pdf
    • http://dobre-jaja.com/Upload/file/nibisoboloruporo.pdf
    • https://gift2goa.com/ckfinder/userfiles/files/79822127760.pdf
    • https://fond.ru/userfiles/file/90678507227.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b18768d600ba89937f4a0993bced4e2f/28466037337.pdf
    • http://perfect-aerosol.eu/userfiles/file/53565076314.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/47157781685.pdf
    • https://smshealthcareservices.com/ckfinder/userfiles/files/tumowobutof.pdf
    • https://gadesign52.com/uploads/files/202109230223286573.pdf
    • http://siamsnail.com/media/userfiles/files/veniwowed.pdf
    • http://wiskind.com/filespath/files/20210926221819.pdf
    • https://hometutorsdelhi.com/userfiles/files/zawar.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38067771614.pdf
    • http://ruresept.ru/files/file/wupitosiwu.pdf
    • http://kor-ra.ru/UserFiles/file/nojalililipivanoxupusi.pdf
    • https://matrainagycsalados.hu/userfiles/file/pimipuxukawe.pdf
    • https://irastuff.com/admin/ckfinder/uploads/files/72048262343.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bus+simulator+ultimate+hack+mod+apk+download
    • 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_off0000b1b2.bin
d5063029f5aacf0bc58535eb4c650829b610de8de6ca9efa3b6a23657b986724		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B2 17440 bytes
font_01_sfnt_off0000de5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 16792 bytes
font_02_sfnt_off0000f673.bin
eb48fad892cf32b8a55c0e3d8697b320a81a3afecd294bd798544ef8798ff16b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 11112 bytes

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