Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbc0b9a3856b346…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 02:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb67d020d5cb68ee04843e0b1821d74d SHA-1: ffe8277cbf241fb22ba59f4ad693049a10c41541 SHA-256: afbc0b9a3856b34611b99915b7560d036d70d21a154533e7e52f1e17b71179b2
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or a distribution point for further malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.akilciilacdernegi.com/ckfinder/userfiles/files/redusitakeferufadaf.pdf In PDF document text
    • https://bizimpin.com/calisma2/files/uploads/37449330902.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/pipuxusedukevav.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109021358581724.pdfIn PDF document text
    • https://stormester.no/files/file/nixomab.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/somaxomi.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/dumugelen.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/28468355102.pdfIn PDF document text
    • http://melabo.com/upload/files/rutetuvumoxujosufelixagoz.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/wutinideroxasowekiwewewa.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908193140.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/14666051776.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/33646097244.pdfIn PDF document text
    • http://newworldss.com/uploads/file/bipolefirevo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/garidini.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7b25313e---49759510782.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/zudutuximemudemifetir.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/7219614722.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/ximitisuzadaderusiwog.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/nonusedezimexurigamigoro.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/dinekawuvewubiwukok.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/1011654824.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/zufamupolomuvodig.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/jovivojisilinawozajugil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=telegram+chat+folders+androidPDF link annotation
    • 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_off0000b31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2E 16292 bytes
SHA-256: 6f035789eca667169c27b945df26be5c01ff5b3e6a34cf3cca9b291e015b7d04
font_02_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 10888 bytes
SHA-256: ae17848ea630aaceefc350e3dedfbc98d57fb1325cc5011ba0c307a019bf8db7