Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2a5ab991811f67…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 13:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b65326fab4470082f2d70cbc0c1bdea5 SHA-1: 36d9a7093f45103dabf1920576f3cb64ad79e687 SHA-256: 3b2a5ab991811f67ef6ff11d71877f5c2a244d2b92fe1911e0bd287c8aae3e56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=app+para+identificar+musica+android PDF link annotation
    • https://vnsteeldetailing.com/UserFiles/files/14787712553.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/11993060164.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/31415540137.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/54220835416.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/90454542264.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/91012479001.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/fupibobiraferupejuxerute.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/52155669576.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/lajimalor.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/giviloxog.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70f12232f---mitixevuwaj.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/16669860892.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/bodogoforowukomuve.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/63637758847.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/kisulo.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/23544426051.pdfIn PDF document text
    • https://mbbs.hr/files/47270063299.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/35859085337.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/kexekipifotolurafogalerat.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/dakopasinakomixekapovu.pdfIn PDF document text
    • http://askort.pl/Upload/file/kabenoruxinefozovabemalun.pdfIn PDF document text
    • https://renewone.de/files/kokipanuvupirij.pdfIn PDF document text
    • https://onecre.com/images/content/files/39810627359.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_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 10816 bytes
SHA-256: cc2c41c8321fc759afbe3157fb85d02e36f27e8cdbc4f277dd0bd887d8be7b64
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 18416 bytes
SHA-256: 2a4fb6c12642d3590e2a9cc20278df4833cfff0a56ce79d357d4aaeb247eefa5
font_02_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1