Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed0d15aa2e09410…

MALICIOUS

PDF

87.8 KB Created: 2021-09-23 06:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af6723ad15aad2c659155b9f23c8473a SHA-1: 4b96330818f2da4cb9aba4b15b7a03c7843d83a8 SHA-256: 9ed0d15aa2e094107ee4bb69cdb61a33eec9b1b13c4eebf36f9f1a5d1ed5c288
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a large number of links on potentially untrustworthy domains. No scripts were extracted, but the structure and heuristics point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://pistant.ru/uplcv?utm_term=how+much+to+fix+android+phone+screen PDF link annotation
    • https://mami-m.com/Uploads/userfiles/files/36728718268.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141025121317---vesotusisuruzo.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/19186542580.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/49177113916.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/pefegogawafuwiwod.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/pizibenuzewa.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/favewojanel.pdfIn PDF document text
    • http://badgerhillfarm.uk/98829461927.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/197769ab42dd9b69de6e7357bb06d799/lesixutanizikobisebofa.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/42999585842.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/13783689704.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/33359603425.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/vuwumitezo.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/tolitid.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/fetesij.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/soxivukakesikajiku.pdfIn PDF document text
    • https://maria-galland.ru/files/file/papugiwo.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/motanalixomabubekel.pdfIn PDF document text
    • http://hak-al.com/resimler/files/26217543720.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/17916667249.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/5665362565.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/31736911167.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_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 11120 bytes
SHA-256: 6e0480b126b26b0117590ce287015cd70ba3f6e129800dd323e90c4af42e06f8
font_01_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 18856 bytes
SHA-256: 8443fb03b066b82e78de2c993990832592614b3c16882ca37dd26e59c5b7db84

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