Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a6933af54ad8cd…

MALICIOUS

PDF

67.1 KB Created: 2021-09-27 19:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1df5c13135fd1d968a51a61d01b0c1e5 SHA-1: 4561556ae63a9a7aa495fddc331ffa06c9cfe31b SHA-256: a5a6933af54ad8cd42979dfa18b7c78e01ad2975f0851fd386bf90d9564e6af8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URIs pointing to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting a phishing or spam campaign. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=new+tamil+movies+2020+watch+online PDF link annotation
    • http://vankouwenenmastop.nl/UserFiles/file/lejepukixolavepavo.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/6254410985.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/xixisetufopitazizevumer.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/tuforox.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/tabosirarenijakeganaxij.pdfIn PDF document text
    • http://topstec.com/d/files/40012791833.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/rasoselaxotitukedosevazax.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/zelefumixofivit.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/98139325154.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/butalimilobopufij.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/67031969800.pdfIn PDF document text
    • http://eichler-kammerer.de/gegobedadijegojujuxifigov.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/54600069230.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cac759bafbdee67871aef7c902c2a4ec/pepanebezo.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/58272659441.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/73183425429.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/bejugidiwivexojuwamuv.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/rimixerokimebedagu.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/lovekizusade.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210906_170154.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_off0000aa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA62 14488 bytes
SHA-256: b3debca6781e1558a537b52cd6fefb52d225cb5312c234211fb1b247e6a5b01b
font_01_sfnt_off0000ce84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE84 10768 bytes
SHA-256: 35eff92114e630ef77a18875df71a71fca06af5e61f94735bd50ca33f5b01505
font_02_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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