Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb6a46a0402176d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-28 03:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0214e9857428ac9046a15167dcd486e6 SHA-1: cb47f33b6b9c216cd646c7c9c5657fe9efc0a972 SHA-256: 1fb6a46a0402176d4190d210eef8c64c8cd9ec3c237d6980633746d9919c5929
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with several pointing to unknown or potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/xasobexegibamofolopinom.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/764158b08eca8ab786c3e500c3c5cb02/pijilimujafefeke.pdf
    • http://nfc-lampang.com/user_img/files/76523002559.pdf
    • https://sanaspinler.com/calisma2/files/uploads/pidasuwajoterumu.pdf
    • http://isystemlab.com/admin/ckfinder/userfiles/files/ropagevewesorirorizunixu.pdf
    • https://bruceleevideos.org/images/file/beregunixapumexunojupate.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a2e98feb7da2f92a98885dcd150b43d0/nazojolo.pdf
    • http://saint-party.com/media/file/33631771476.pdf
    • http://suvagcentr.ru/userfiles/files/16131490967.pdf
    • http://www.gamylai.vn/uploads/files/22477964782.pdf
    • http://mintaialuminum.com/d/files/78892071387.pdf
    • http://gesundimjob.at/images/content/files/17514655571.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/pemevemozesavepi.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62346723133.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/93443264350.pdf
    • http://mousike.it/img_ins/files/todupudituzur.pdf
    • http://uptindia.com/newsimages/file///45581492757.pdf
    • https://eagle-aviation.com/userfiles/files/sodepatabudedel.pdf
    • https://valve-toho.com/userfiles/file/pojagupanedadufidinasited.pdf
    • http://lamorenj.com/userfiles/file/turuva.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=star+wars+rogue+one+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_off0000bad6.bin
89bda5fd235a40dcc2f247c619bca33be93ac96326f6758d14c770d1e0f5ba0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD6 11076 bytes
font_01_sfnt_off0000d4d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 16792 bytes
font_02_sfnt_off0000ece8.bin
cf188a4e5240f60b5d2df0ed75127f6177ff9c8c72562975a7e5b2f9e5788fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 19116 bytes

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