Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf04606a8a8a11c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 21:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5a9aafe537829bfc300da07e3ebe79c2 SHA-1: 4f3816503b951b1fd0f16a641f4d6a356b9230bf SHA-256: 6bf04606a8a8a11cbba7cd696c7574272a373a19e572c3e5d076e96cb560fc24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to link farms hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users through multiple sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://pistant.ru/uplcv?utm_term=android+hardware+acceleration+setting PDF link annotation
    • http://americasbestwingspa.iorderfoods.com/uploads/files/tiwugesoru.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/84907374938.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/50686946434.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/mokewuwidedokosazova.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/47910224245.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210910175404.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/jejux.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/62832623175.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/53513451594.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/59942657971.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/gufilazumumel.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/rogejozatiwanivim.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/dezasoginogiw.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/98890877424.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161307b2fc8709---39978066106.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/digik.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/liwapomade.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/wabefoziveseg.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/dinib.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/27299263614.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/zepofixenolume.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/zanopuzabapawuliwinuj.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/wezugogesoduzuwizemigo.pdfIn PDF document text
    • 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_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 17332 bytes
SHA-256: 13ab5bf9102fdf7a5702bdd5708ee958c7f21491e99d27e73b080776896a1270
font_02_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 10716 bytes
SHA-256: 36bddfe3934ad9efdc26f020d06fa7e02421b14384ce8cf8144296e5e3634eed

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