Malicious PDF — malware analysis report

Static analysis result for SHA-256 3657246ff220403f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 02:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b3a73e67de37bbfdfd9bce208c7c9575 SHA-1: 632c4042bf4b7191977ba035fc1500f4047a3cfc SHA-256: 3657246ff220403f362f93f879e24a712bea2cceeef6f3cdb2677118e1f3f0f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files on disposable or unknown domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using multiple distinct hosts with minimal links each, often associated with phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://imhyuk.com/imhyukeditor/userfile/file/lomibowimo.pdf In PDF document text
    • http://zzzwchem.com/upload/files/78114682101.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/33586115.pdfIn PDF document text
    • http://nut-shell.net/upload/files/kasofovonoxasoworamap.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/11665328084.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/28316468770.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/18986994153.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/mepebaroru.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/66849317215.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/soreduwijuxaju.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/85601899583.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/sogavarusetesozi.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/79031674740.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/68610558852.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/74925554722.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/ranevajutanegigirivu.pdfIn PDF document text
    • https://superchills.com/userfiles/file/41483087335.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/sikelajenibifuwamekilirap.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/54221045278.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/nazulowavudenidezedibo.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/11944171545.pdfIn PDF document text
    • https://iword.de/userfiles/file/batox.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/gezaxuj.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/mujibibonugos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=access+recycle+bin+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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 17576 bytes
SHA-256: 9c3f02e6b79e3d53a69e3730f3139e7c4b60b6f8da5b9cf84c99724ff0a730a3
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10500 bytes
SHA-256: aedae1442a48d610d0d9603e6c541467786111477a9890df9ffeab53dde0ab0a
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1