Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c88560676a84a7…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 09:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eff8704f9995eb700ab1f96acfb7927d SHA-1: 2e0cc0c96ebdeb704098247f9b73b020a1fcb076 SHA-256: 14c88560676a84a73b02cd50853ab8d06bc86d6440e710e0cf5464477aca100b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, including one pointing to 'wastran.ru' with a search term suggesting a lure for device location information. The PDF's structure and numerous links suggest it acts as a dropper or redirector to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=find+my+device+location+by+imei+number
    • https://birotex.rs/images/files/vewumiwixafapeluzupapum.pdf
    • http://aristosaigonhotel.vn/uploads/files/lamivafapezuwemufogajawat.pdf
    • http://runhouchem.com/upload/files/92158328485.pdf
    • https://jooli.ru/ckfinder/userfiles/files/lemisenip.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/36861444079.pdf
    • http://araratmebel.ru/img/file/37069375306.pdf
    • https://ringid.vn/ckfinder/userfiles/files/nuxorevirinupuzaturi.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/43026698470.pdf
    • http://cdenito.net/userfiles/file/sowukolaguwelenak.pdf
    • http://shinies.ru/img/lib/file/73089399188.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144b88f347e6---safuxona.pdf
    • https://vespaclubcagliari.com/userfiles/file/kidaniwa.pdf
    • http://hdurmuslar.com/images_upload/files/xesakoropijeleso.pdf
    • http://www.fdconsult.qa/public/uploads/cms_files/komenonasimi.pdf
    • https://www.l-games.jp/js/ckfinder/userfiles/files/76602091365.pdf
    • https://alubiasdetolosa.com/files/galeria/files/nejurunolizezebamatif.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631538787_ba88b79035.pdf
    • http://ramenzoni.eu/userfiles/files/lozakisobunumibe.pdf
    • http://posicert.com/upload_fck/file/2021-9-11/20210911221508263008.pdf
    • https://mobiligennari.com/userfiles/file/bisawugutopaxap.pdf
    • http://gramercy-grand.ru/files/file/dusejuwadefebelugonopixu.pdf
    • https://pima-alarms.net/slicice/file/lotanib.pdf
    • http://elektromig.pl/userfiles/file/robiteviturasawet.pdf
    • http://eptesteplelek.com/uploads/file/15501861528.pdf
    • 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_off0000b2e9.bin
11867cceeda7050f95b42b15b288955c5d11a1cf766ad292a947157c718c1b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E9 17724 bytes
font_01_sfnt_off0000e05a.bin
745fb35f4802ef2e28f2661eb844f19f55f07877a170326f5c6de66b3e9d2ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 10760 bytes
font_02_sfnt_off0000f90d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 16792 bytes

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