Malicious PDF — malware analysis report

Static analysis result for SHA-256 649b945fa871d626…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 08:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1922feea34fe2bdaa167fda4655359d SHA-1: 1c1727fa8b5d0d73bb47b00fe8ed7fcfcb982523 SHA-256: 649b945fa871d6269569604b5f8222fb3a2fd73664a0c60aad251b751966f6dd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous external URIs, with several pointing to disposable hosting and one directly to an IP address, indicating a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=free+aphasia+apps+for+android PDF link annotation
    • https://vozilasavozacem.rs/files/56759069586.pdfIn PDF document text
    • http://ukrfirework.com/images/file/94618915910.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/galodunadelox.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/63709907763.pdfPDF link annotation
    • https://machnik.net/ckfinder/userfiles/files/betaseforit.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/68275073651.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/56855778526.pdfIn PDF document text
    • http://ergakiland.ru/files/files/feretoka.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/31379144472.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/53524805825.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/varositarejiwenevuje.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/65881534628.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613679c68582b---71508298909.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/54526712988.pdfIn PDF document text
    • http://status.cz/UserFiles/File/15231346688.pdfIn PDF document text
    • http://rc-modeller.se/images/file///kezoduxezomogude.pdfIn PDF document text
    • https://tcremich.lu/files/files/89616685563.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/wugikomuniv.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/nafejoxawezisesiw.pdfIn PDF document text
    • https://tenfci.net/userfiles/file/tewigudib.pdfIn PDF document text
    • https://5uempat.com/contents/files/72038314744.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b65bb09428---29692953880.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/bemizuwesogejafako.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_off0000af95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AC 10428 bytes
SHA-256: f9bd90f1fa3b61ab83230d3ea8539df15659119b93b5f37fadb94171838a74e9
font_02_sfnt_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 15068 bytes
SHA-256: 170d3b44bf50b028fa1a8a2c54e30177ce0c0298a5af31364e6f6ded2ea4a837