Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a59b5837165494c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 10:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67ef7bbe4da20669a3f2d495587def3a SHA-1: 5b3ed63c88ba84777333640f52255e116d611d13 SHA-256: 5a59b5837165494c4923ae728ecf511569c03e4be3262ee7ab5365aece445e5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or are part of link farms, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting. No scripts were extracted, but the presence of many external URIs suggests the document's primary purpose is to redirect users to malicious sites.

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=undyne+fight+online PDF link annotation
    • http://narnivet.com/userfiles/files/nudivixeve.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/vowoxokatexananudabasod.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/wijurani.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/45039484482.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16145855678a23---zadidamizi.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/79931884514.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/93951257.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/gakesimemelemapuluguv.pdfIn PDF document text
    • http://donghotam.com/luutru/files/27929211848.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/kivowemuza.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/dalujofari.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/69958185924.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/16893929468.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/serebejidet.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/kutixapepolugos.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/60096362771.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/fawimatarenobexofaxotanup.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210914183134.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/namefef.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/33226641661.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/fejabax.pdfIn PDF document text
    • http://potya.com/76160335426.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/630528181.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_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 10324 bytes
SHA-256: 3a9da9f754253fd8e59048eac51d30e8e3404267473ee748c8220f49aa1893cb
font_02_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 17588 bytes
SHA-256: be2b7b35ca5f2a401cb3b06d4663bd3dfd2533031081e35d83356b509ac410dc

Open this report in the interactive analyzer, or submit your own file for analysis.