Malicious PDF — malware analysis report

Static analysis result for SHA-256 a772f546f9226b3a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 21:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41b010526f920958cfb5c1fd1cde8166 SHA-1: 677c1a8a03f5f14dfbaee32ad2a42d5e8ed25842 SHA-256: a772f546f9226b3aa52d6440c5bb52a0cb8c0e5d2e82373ca21e5d94fe2e8fc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=reading+comprehension+for+intermediate+pdf PDF link annotation
    • http://0975811252cool.linker.tw/files/juvujabubezo.pdfIn PDF document text
    • http://mastervin.ru/files/file/14930836126.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/50644634628.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/gofugexirokeverafimiv.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/35835622957.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_F471BA608508526E.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/10681797693.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/47890390218.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/89493557949.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/gululixizorunakusawinitot.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98c560d7e---62684840868.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/xumewewoporowupifal.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/88005917707.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/tabitagunut.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/27207696323.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/nudasojaxonujet.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e618ce5b---91544905774.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/69993551482.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/wosezoxenatokaxogirufute.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16132f2782bae3---57058121796.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/mexidenanuzikesig.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/19922001872.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29761228452.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_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 17476 bytes
SHA-256: 4be5b485f2ea5afb6838b3e2ebc6044a87fbcd2d81caccb00235b04bd27f5d0b
font_01_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 11068 bytes
SHA-256: 4b0714eb219cee635057ace59d7a33b6f122fa9928635a9e207a14eff3b6d73e

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