Malicious PDF — malware analysis report

Static analysis result for SHA-256 b665346b490d33ec…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 18:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 335c44806cb040714c1e578cf3192024 SHA-1: cf3f6d4a5fe5d2dcf9308567b0a2ffc8a4933360 SHA-256: b665346b490d33ec5d99fd401e5a5fb22b395f7ae5815d90ed2bae31788708ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as malicious. It contains numerous embedded URLs pointing to external domains, many of which are associated with link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URIs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=translate+arabic+website+to+english
    • https://pastravariaizvoarelebratiei.ro/images/file/fozuxukamiruvajesu.pdf
    • http://shinies.ru/img/lib/file/lepep.pdf
    • http://tipsclubcr.com/campannas/file/56359930073.pdf
    • http://cosyromania.com/media/file/letivokisapizujepapitata.pdf
    • https://guapa2.com/admin/fck/file/42234036319.pdf
    • http://w-f-l.de/user_img/file/fududiro.pdf
    • https://emenu.hu/editor_up/74547580162.pdf
    • http://jn-zhsc.com/upload/85814566632.pdf
    • http://immobilier-valence-agen.com/userfiles/file/46182778393.pdf
    • http://spbmedax.ru/sites/default/files/uploads/81227677266.pdf
    • http://palirna-frydek.cz/uploaded/file/75171022711.pdf
    • http://eiak.org/upload/editor/files/dilunapegupizo.pdf
    • http://thechelseaff.com/user_uploads/files/2250969466.pdf
    • https://thermaltrailrace.com/imagini_ws/95340125368.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/milutot.pdf
    • https://irastuff.com/admin/ckfinder/uploads/files/23455376642.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16136bcca34eb7---4471865461.pdf
    • https://studiovizia.com/webroot/img/content/files/80246713610.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e0e5d8721484cb002f56ed9ec93d280/kejuxina.pdf
    • http://gramercygrand.ru/files/file/93772769832.pdf
    • http://falerisztika.hu/tmp/94644187530.pdf
    • http://clerus.hu/files/file/7258642764.pdf
    • http://chetaomaynganhnhua.com/uploads/files/50286688575.pdf
    • http://rimini-portal.de/bilderarchiv/file/piwajub.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_off0000b12a.bin
2f70f74d6e14ef8179c7e3abc0b744be10327f4676d9f3d0672df172443fac10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB12A 14612 bytes
font_01_sfnt_off0000d5b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 16792 bytes
font_02_sfnt_off0000edc9.bin
2cacf13689fbd9293d893738eab732fe9d5e53eab72ab2ce43da066b7c86652a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10696 bytes

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