Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05efe5914a54499…

MALICIOUS

PDF

68.9 KB Created: 2021-09-23 05:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43c854449d00800c0dc9d2f91e60cfd4 SHA-1: c94ac740f73d34caba2632fa89b8cf7290e28d39 SHA-256: c05efe5914a5449952116f9907bbc14005201aa95760e7d51eba7fdc624f436b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external websites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://ketchas.ru/uplcv?utm_term=android+10+ntfs+support PDF link annotation
    • https://pfollowers.com/ci/userfiles/files/54394652243.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/51977702035.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210904090032.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/74110769210.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210901205342.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0415f9af66f81c2b378b74270d69b09c/31547111567.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/3754373094.pdfIn PDF document text
    • http://wdnederland.nl/file/vixuvotisek.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/39976996365.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/voziji.pdfIn PDF document text
    • http://mweb.cz/images/file/fepovoperatog.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/49058361721.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/vamoxu.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/vozekekuvuwiterovivorof.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/33251079968.pdfIn PDF document text
    • https://wonkingchina.com/d/files/61407101087.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/xonosurexu.pdfIn PDF document text
    • http://vuason.vn/upload/files/manemaxejagu.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/nolikalupalonumaxo.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210923082633.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/dapifizegu.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/sifunosekomamasazujaze.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/94824285324.pdfIn PDF document text
    • https://bselink.com/userfiles/file/nikudanan.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_off0000ae09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE09 10404 bytes
SHA-256: a8273144e70d2f5834de8ace3dd79cd5053f9b1ff368ab831dc6286ba59d20aa
font_01_sfnt_off0000c5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 15668 bytes
SHA-256: 198e975006ddb2c574bc2419a57a17ade625d732553c0993e6c84fd4643e343f

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