Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dba5664c038a6b…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 01:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2b74df825649993f5ab3df813e62195c SHA-1: 98865c5b58c9c6734ad0e631fb9eb5db93bd3ae6 SHA-256: a2dba5664c038a6b41c9ff9fbdb6dff44f690f69b79281d7c02e8e6f2fbe1fcf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is used to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=canadian+short+stories+pdf PDF link annotation
    • http://garankuccu.com/upload/fckimagesfile/ed7ef4d341ae839d24bea44f7d4d57b0.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/9543371560.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/wevun.pdfIn PDF document text
    • http://www.andreapondika.cz/file/pezusa.pdfIn PDF document text
    • http://asid.rw/userfiles/file/fifukadijagebuzutugodaxu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e7c261b05---58841139823.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/penetefapozasuwomalone.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/nisosijoxubav.pdfIn PDF document text
    • http://keitbg.com/images/files/12956181814.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/55286709917.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/mapefibemetujilupatodozi.pdfIn PDF document text
    • https://izometal.net/mm/file/96734321171.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/weburevojabezojofip.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/41474362377.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/12480046383.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210912153610.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090304573273499.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/30835538635.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/sokuteta.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/fopadiruxev.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/85836907778.pdfIn PDF document text
    • http://ave-france.com/pics/files/menaper.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/23744470749.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/47259106435.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_off0000ae6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6C 10580 bytes
SHA-256: 0c726aa1cc87c3f7182f942845abb6b8fb1dfdb1fb8f3390e72d6d43627c4dc0
font_01_sfnt_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 14972 bytes
SHA-256: 43ccfc8396e8cd4d3f6ce447d7075cdba037bc926e1f30495d4652e4eb038bcc

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