Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5667a1079dad65e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 14:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0c1fc4db6851a8b71f0c56793b7f570 SHA-1: 4c2d41bdebd9a671d1171b487d250ac7abd0cbc7 SHA-256: f5667a1079dad65ee0099ce92940c7a3b1ee7c33caf79a30899a5f6309e7c0b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • 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 http://ecovn.vn/uploads/news_file/28036997569.pdf In PDF document text
    • http://lumieretvie.com/userfiles/file/43635547351.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/90345430030.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/laxuji.pdfIn PDF document text
    • https://ottopianos.nl/files/nabefemegafedoneviguga.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/piwinamabuziluruva.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/1102192221.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/62090209395.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/8141456758.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/28261363828.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/12175480318.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/5110759618.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/sanis.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/83884843524.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/bofinaxugokin.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/nixujomanipenanax.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/14080421199.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/88764825403.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/mubabapofatuxog.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2c6c70d6---62673641823.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c90341d0e615c22f14955a327b4bfd17/jodupasujud.pdfIn PDF document text
    • https://tl-systems.hu/files/files/ketofovivi.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/91297982558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=9mm+hd+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFB 10080 bytes
SHA-256: 442ed2599852c66943c390c06f30e78624af6d071a1705b4a070169d864035fa
font_01_sfnt_off0000c460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC460 14900 bytes
SHA-256: 46b11113d404e78e0468275f2f6db57b26181b39af82edf47edd14a1f958c1de
font_02_sfnt_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 2088 bytes
SHA-256: dc5a0cb52cd6f2740554fcf297c3a95f5a563222fd29433c1f6f22b7b8dbc2e9
font_03_sfnt_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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