Malicious PDF — malware analysis report

Static analysis result for SHA-256 6158c243a923929d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 13:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a62988ae2d903f01b38e8f9674747256 SHA-1: c5d880090728334a1915bda7fa62bc8b40572bdc SHA-256: 6158c243a923929da964e2f734bbd9155590c4810ea2e3459c860be5c00bb4c3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The document functions as a link farm, with numerous embedded URLs pointing to external, often disposable, hosting sites. This behavior suggests an attempt to distribute malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://queure.ru/uplcv?utm_term=farm+heroes+super+saga+levels
    • http://watthaistuttgart.de/userfiles/file/84092647552.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210907_7D1399328E0E0BD6.pdf
    • http://anipetkingdom.com/webroot/img/files/rajumu.pdf
    • http://myslizdrave.com/soubory/wokoniwosed.pdf
    • http://alpha-cp.com/userfiles/file/59923638573.pdf
    • https://marblobathware.com/app/webroot/img/files/vebakasebolaxexitorax.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/81398198015.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb03b78da---73494707260.pdf
    • https://virker-ikke.dk/files/97971497274.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/nozuruzufubegufubixas.pdf
    • http://lacasedescaraibes.fr/file/pojevabazuzepi.pdf
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/doxibajunuvepikol.pdf
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/78395806170.pdf
    • https://eijo.in/ckfinder/userfiles/files/74024943268.pdf
    • http://ventima.ru/userfiles/file/38358109080.pdf
    • https://pasarantogel2.com/contents/files/4242897312.pdf
    • http://archiw.gbpopatowiec.pl/img/upload/files/zifijuxesan.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/76555984554.pdf
    • http://allycatering.com/userfiles/taxavilazumewizivafere.pdf
    • http://chickendaylacrescenta.com/uploads/files/zareligadupebojeluxetugij.pdf
    • http://murielbellhomes.com/userfiles/files/66377031141.pdf
    • https://techielingo.com/fck_uploads/files/78306988100.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_off0000d9a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 16792 bytes
font_01_sfnt_off0000f1bb.bin
f161999349ddb8fc21fb7242de079a613baf11af91a07979bb25c8cc0808a440		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 19496 bytes
font_02_sfnt_off0001251c.bin
5206713c9a7e17b2cc3d2d03aeb7813e34f36efd9a072e4f16cce3eb847d561e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 10548 bytes

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