Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ac6ca81230db7e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 03:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cdc0705e56e9cc534fad8483f91634e SHA-1: 71c266473ad6e84482dc7ec2d9aa8204cc332068 SHA-256: d6ac6ca81230db7e99aa14e8faa0e8717fd2c934584ec649c1bb3230e5967bb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing or malware hosting sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.verimevzabavu.cz/ckfinder/userfiles/files/bukewafi.pdf
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/mexisopodegugigo.pdf
    • http://pelesiuvalymas.lt/i/File/tobajalizakuraxibonadosi.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ee8a7c6c28b8d97d6307117a3e2fe196/mufaxunirobizuvet.pdf
    • http://suliaok.com/v15/Upload/file/2021919457564501.pdf
    • http://vaithun.net/upload/files/lugepu.pdf
    • https://stratasphere.online/userfiles/file/95680324806.pdf
    • http://sva-jeanroze.com/xmedia/file/nanejedogowegam.pdf
    • http://lachambredechos.com/userfiles/file/mamugiwamotemug.pdf
    • http://mezon.jp/userfiles/file/67378208129.pdf
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/54503382215.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/5483621209.pdf
    • http://mastervin.ru/files/file/jiwevewemati.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/02278213613fa2ced29acd8e1a9f3fe2/gewupuvexalorivemumewa.pdf
    • https://ensegun2.com/ckfinder/userfiles/files/sobunixif.pdf
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/64073165896.pdf
    • https://aluminiosarla.com/userfiles_arla/files/65680652703.pdf
    • https://al-farh-iq.com/upload/userfiles/file/63241973761.pdf
    • https://granitabrasive.ro/editor_up/20710694895.pdf
    • http://clear-es.net/yamituki-n/uploads/files/50457540246.pdf
    • http://colorfusion.us/admin/images/file/botase.pdf
    • https://ev-owners.jp/userfiles/files/54232981243.pdf
    • https://lotte-ppta.com/beta/assets/file/7630257670.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+apps+on+ps4
    • 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_off0000e5a6.bin
e4d283c7b5ccf6bd14ab662505af3a8ebd3f07e35609894951300a54907967b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 18112 bytes
font_01_sfnt_off000114cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 16792 bytes
font_02_sfnt_off00012ce2.bin
e73c6c1921d3160ab7033442173425fa2f17ee9b2e932e0f29662e20a1f0d8e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 10168 bytes

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