Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca46061938fbe02c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 01:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a94aa29668aad06a2e3d1a0eb857356f SHA-1: f3eec543ffb5c8e1f9b7e4a9046b703a4885db9a SHA-256: ca46061938fbe02c7e8c77065f701a1efcd79fb4dd98e562a870ace1e37e8d94
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The document body is heavily obfuscated, but the presence of numerous external links, including one pointing to 'crewmak.ru/uplcv', suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=rubber+ducky+android PDF link annotation
    • https://biothiennam.com/media/ftp/file/matavokutixigovafojibe.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/vaborud.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/47237802426.pdfIn PDF document text
    • http://creationart.hu/files/file/17804000701.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/sogenewiga.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16130a9332f6a7---wozagexos.pdfIn PDF document text
    • http://penetrat.ru/files/files/votag.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e3cd638d0f9766c64f4cddfb07459cc7/74462110364.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/jijemazuvivaxumiropu.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/radagisugixekovu.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/jigixitibofixadokasixo.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/92572847273.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/xofoke.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/vosurawine.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/rakeziwukon.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/94992784847.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/37318745743.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/wapovixujimikamatip.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/bopivuvixuxad.pdfIn PDF document text
    • http://jucal.es/images/file/tuwezuva.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 19680 bytes
SHA-256: 205eae436890e14b34f915554c8457f496acce1cb35acbe46bdb46b34a4655a9
font_01_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F4 10540 bytes
SHA-256: 844a4d6a80ec9715c19110ae79da7dafefcffe2768c1bb4d76656a36fb4e0122

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