Malicious PDF — malware analysis report

Static analysis result for SHA-256 345d397c70c8e982…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 06:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c59064b73beb8dc7ac10bd89c6640f1 SHA-1: 4c48665f559f771e4a3907a82f29209ea01e0194 SHA-256: 345d397c70c8e982c449ee36d25f1cba0ea8593c17075b839603c3278747babd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://playonathletics.com/userfiles/file/13718100165.pdf In PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/dabapetusir.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/vanoj.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/44276371149.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/16275271600.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/sidexodevitopomunimike.pdfIn PDF document text
    • http://beta-rc.com/upload/files/90190030689.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/nopijigesibimijuviw.pdfIn PDF document text
    • http://philboyd.com/vivudiziji.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/sejik.pdfIn PDF document text
    • http://ccadl.com/files/20210906193809.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/12708594810.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/vokobaxalewipe.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/metebaworitulifunon.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/labiruwewebevatipoxi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3uddhiberohbpd8mghtebuejuf/69721553262.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/14894291679.pdfIn PDF document text
    • http://congluc.com/upload/files/nonorebiga.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/wilaninegetisox.pdfIn PDF document text
    • http://coffee33.ru/archive/file/tutabipowagarelat.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/41990977560.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304b6def080---50789614872.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/gikukevuk.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/nufigik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+minecraft+for+free+on+android+phonePDF 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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 17936 bytes
SHA-256: 9d3581beb15edeb92fe58e71f45336613fcf6db97308cdfea05189e52be2d8cf
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 10932 bytes
SHA-256: 8d379629e9acf1bd0de3b3f5409293027f74ff0e8c2c860116420c9deb49e28a

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