Malicious PDF — malware analysis report

Static analysis result for SHA-256 87206224477160de…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 14:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6e4adcc3c85dcb2649159f66c71fcc5 SHA-1: ba188f2c87e9d9ddbb82f630e32f6914173b4479 SHA-256: 87206224477160de2bdf8d6883e09c5d2dfb4a19ca80b0fa0c244cfbbcdffda8
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://binarbaidequipment.com/public_html/userfiles/file/feteputuwakoj.pdf In PDF document text
    • https://altstudio.be/app/webroot/uploads/file/69497116538.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109120227502744.pdfIn PDF document text
    • http://ud2-140.com/files/20826634643.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f7fc8e54c496e64951a92b2328b705e6/21569658511.pdfIn PDF document text
    • https://dm288.com/slicice/file/pagikuvajudetodono.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/89419251866.pdfIn PDF document text
    • https://interconformity.ro/images/file/lageragurakejifu.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/kumizoni.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/87624828692.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/05/jupotemibulobifudo.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/35153026049.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/76381405987.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/70800340082.pdfIn PDF document text
    • http://vaithun.net/upload/files/42682193194.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470bb9ddf30---xowosoxuxaneruwewonubonog.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/13425589885.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/mudefoposula.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/27320456238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=como+borrar+cuenta+gmail+de+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_off0000cf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 18196 bytes
SHA-256: e9c34b1d301d0b96b0717a1d89aacc75644a7724836b6ae131aa32a8e3877bbf
font_02_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 10816 bytes
SHA-256: ba28ea70f336aedcd428aeb8df8fdf1119d0a1d1d9ff47387ad240423293bf66

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