Malicious PDF — malware analysis report

Static analysis result for SHA-256 7453fc45d5d893d6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 21:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4294f7e930f9f4e6c9d93cd77638e800 SHA-1: a49b51b3de5d5b0ab5aeebbc2351c9014c655418 SHA-256: 7453fc45d5d893d676893059a43710a639b6744d390d983f7750c5d32d49df96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=android+system+memory+huge PDF link annotation
    • https://anitt.in/ckfinder/userfiles/files/mudedakubobusuvajuvis.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/35312886581.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/66424230310.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/detevutululenewowixoki.pdfIn PDF document text
    • http://rjt1.org/upload/files/fudelakezul.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/puxirirezokimo.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/rixudofobidavirixalazi.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/fugabokake.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/wutav.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/puvanuzewepi.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/jasenibefazudorup.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/nugewefixosaraduno.pdfIn PDF document text
    • http://gotween.com/userfiles/file///jaxol.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/zibixuvuzusovabe.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/wesiwikazu.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/83846593416.pdfIn PDF document text
    • https://italvaping.com/file/faputaxejilekorokej.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/26679631183.pdfIn PDF document text
    • http://topstec.com/d/files/73446788256.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138de23f33ed---buzurixo.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/botufifiribax.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/19149994610.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/pobotelidaxali.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/mitomod.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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 17668 bytes
SHA-256: 18f252c21f373bfe6fe7bf840fb5aec5620d0e6720c762c3022478de0dd6dbeb
font_01_sfnt_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12693 10684 bytes
SHA-256: 3ef6ff0b7de26ed043254e8d6ec2b502598207e99edf94a5f7cda5a6de06450f

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