Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7706c849e09227…

MALICIOUS

PDF

87.2 KB Created: 2021-09-20 13:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f72d5d8aff712d1ea14924d7d233a194 SHA-1: b6d566259c98afc6ea13a789107494d6eebee2cd SHA-256: cb7706c849e09227399df7aae823e02baefacfc59acee8c9346a3f1f19024e41
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many of which point to PDF files hosted on disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://gaudi.tw/upload/file/78584484040.pdf In PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/82251941008.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/favabogozabex.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/26154219524.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/32093496094.pdfIn PDF document text
    • http://chengzechem.com/upload/files/felibolibesugusarafetip.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/16057209436.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/98132337336.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/viritariw.pdfIn PDF document text
    • http://www.og2c.com/images/file/67454240253.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/80130581632.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/gokajesadinewobisusaxifex.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/fefupotiju.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/rajagimit.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/kagujidubapubunibel.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/39303617261.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/kopugofanijejaxu.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/gimexatebusofupelefumezux.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/8896241380.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/nojakukiviradusejuzoxiw.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lkurrniaujcr46jh234l9mao27/gerolefafixusidebaperoxaw.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/radivokelowor.pdfIn PDF document text
    • http://xhzhengli.com/upload/motujegaxonirifevoponu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9adc684a---67780177200.pdfIn PDF document text
    • https://yodobashi-church.com/16605855535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=psp+wwe+2k20PDF 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_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 9944 bytes
SHA-256: 37a195e5607f2c81581ea07ec97b1295ec45801bb28fee5d4d8364de94dd2f81
font_01_sfnt_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 20064 bytes
SHA-256: 8f5faf75b8e9e7a165e3fee70d775925287419620f001a4124254d3f2d0ca83f
font_02_sfnt_off000136e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1