Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52be52c4f9c7c2d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 15:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e126b2a920e849b3a97f221e62f4a95d SHA-1: 5cad491599ab82303c70868f5edf92069c15dd44 SHA-256: a52be52c4f9c7c2dd85e205a3fb4104409a083456604a5075f1331c1aeaa714d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. ClamAV and an ML classifier identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of external URIs and the link farm structure strongly suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=harry+potter+mystery+room
    • http://phutungototuanphat.com/img-tvdl/files/63562171826.pdf
    • http://sport-zavora.cz/data/file/gawinil.pdf
    • https://sabresources.com/FCKuploads/file/jufimuwemelenujeba.pdf
    • https://alternativecarrepair.com/userfiles/file/67580862366.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/74191261321.pdf
    • https://eastoncn.housemember.com/uploads/files/32585328682.pdf
    • http://hla.vn/upload/files/92983173061.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aea1578aba---65162020572.pdf
    • http://studio-rivetti.it/userfiles/files/73444178907.pdf
    • https://searches.onlineconvey.com/userfiles/file/kizeridamoz.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/33047541900.pdf
    • http://say-international.eu/userfiles/file/84199888627.pdf
    • https://jamurgoreng.net/contents/files/39526234512.pdf
    • http://ceresasrl.it/userfiles/files/vovumexugopegalinelewojer.pdf
    • https://fokusmedia.com/images/uploads/45753997893.pdf
    • http://jawarakreasi.com/file/222566090.pdf
    • http://mascotdd.com/file_media/file_image/file/77983736533.pdf
    • http://exmar.it/foto_fck/file/ziralemej.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/xodufuga.pdf
    • https://ikansambel.com/contents/files/22673153817.pdf
    • https://riosemarescentrodemergulho.com/ckfinder/files/31579470844.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_off0000d7cc.bin
88b0b5c108b510814146944b134f8c9d98fd836576ee923fb5dd5da90423e056		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 10276 bytes
font_01_sfnt_off0000ef02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 16792 bytes
font_02_sfnt_off00010714.bin
d22a5e9b41e256d48ab60d46e5af16ec3ced7b6b8510d78c9c12cb33ac1805f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 17548 bytes

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