Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a1615c4927ae5f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 23:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9e728c37d6a44c788fd07cf32777985 SHA-1: 62a2a3ce1c71664b2bde2066e817acff05b4da88 SHA-256: 20a1615c4927ae5ff2cf95073cbf8dd70859d8a0ed967e8ca74f1a1192d3f95a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with a specific heuristic flagging it as a link farm on disposable hosting, suggesting a phishing or redirection attempt. While no scripts were extracted, the structure and numerous URLs point towards a malicious document designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tabletopad.com/images/file/7100918507.pdf
    • https://patriciobanados.cl/upload/file/
    • http://cheliabinsk.realxenon.ru/uploads/files/33012790647.pdf
    • http://sooam.com/files/fckeditor/file/8770700216132f89f0664b.pdf
    • https://vmwarts.com/ecovic/file/92718481526.pdf
    • http://standdominica.org/files/files/92376073482.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/sepamizif.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/tawufewaw.pdf
    • http://domingo.hu/ckfinder/userfiles/files/79657959372.pdf
    • https://ikansambel.com/contents/files/sutes.pdf
    • http://mydreamtuscanwedding.com/editor_up/lipojogonalali.pdf
    • https://resonanceacteurs.nl/userfiles/file/kitirologen.pdf
    • http://gelinyuanyi.com/upload_fck/file/2021-9-1/20210901210830863675.pdf
    • http://farmandari-sarvestan.ir/images/news/files/26962379693.pdf
    • https://almuhja.net/ckfinder/userfiles/files/39401029223.pdf
    • http://cmrivestimenti.com/userfiles/files/fuxukumisezilafako.pdf
    • http://mijinmotor.com/fckeditor/userfiles/file/67349754580.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/73768503879.pdf
    • http://icaalliance.org/filespath/files/20210901211650.pdf
    • http://studioiulianella.it/userfiles/files/zilofafidifutaroxatev.pdf
    • https://hotel-la-licorne.fr/userfiles/file/70655189737.pdf
    • https://titishop.co/upload/files/85738807626.pdf
    • http://secretlove.ch/ckfinder/userfiles/files/7797036177.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=civil+war+download
    • 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_off0000c0b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B0 16792 bytes
font_01_sfnt_off0000d8c2.bin
a6cbc15a40cd5f95113585dfed424d9d0210468d163cb8010db93e423f8d4fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 17616 bytes
font_02_sfnt_off000106e2.bin
880338f42231ddc406e128ce662a0c55f5a633b81f1ec2c4350e4fa33432e63e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 10028 bytes

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