Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa39c74aabfaa6c8…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 02:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31159491b55a8ab858bf4bfbba502777 SHA-1: 48407ef8f2f81ea19c25930007bc518eabb3d3a1 SHA-256: fa39c74aabfaa6c887b571d677283434c77c3fb9bce23698334483d7d2035d4f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as an image-only lure, typical for phishing campaigns, designed to trick users into clicking embedded links. The presence of numerous external URIs and the ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards a likely attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=play+store+app+version PDF link annotation
    • https://feldmann.pl/userfiles/file/66428974064.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/jubijufamebobozokonas.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/dadanulizogixijadozod.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161464397315df---bapaxisurogavigoriri.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fufej.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/11868564744.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/32369757983.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/xogadutegamovalolewudaf.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/xevigu.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/zimidajugexudoboxajiwutu.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/78361760992.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3e59235e---velawiloged.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/97434543307.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/rodasenipusadi.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/1919109226.pdfIn PDF document text
    • http://sbcnepal.com/images/file/nivutil.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/paduxosorek.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/mejibuputalasopipapaguve.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/19059396961.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/mogejozebidamo.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/53974043883.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/wimirosisujaf.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/tajebupavor.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/43746532163.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_off0000af81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF81 10424 bytes
SHA-256: 2d434b97d1b7e01c6a5a2fbc973b8fe9a68a3731fd8bb0201dbef31f6e007db9
font_01_sfnt_off0000c752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC752 14136 bytes
SHA-256: 8ce241e5518a4d081c1acef4f7f0761a769cce7300d6b6200992dbab84bbe111
font_02_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1