Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4dbd1e9ff6d975…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 21:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f35e1915164d1b9f5459a8534823ea66 SHA-1: 6c1e4fac858d2721357589944ded173a4a44fe0b SHA-256: 5b4dbd1e9ff6d9751d6943ba90ff7766c71a80e219a401502e0b17e75a2fdb87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing a large number of external URIs pointing to various domains, suggesting it is used to distribute or redirect to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=friends+series+with+english+subtitles PDF link annotation
    • http://shepardinteriordesign.com/rw/upload/file/15335586550.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/vexodapidarivofawokam.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/45145394931.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/lofekorokexuketusenep.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/17911390897.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/64519790945.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/pafumoxurajexopaku.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/79852935240.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630527971.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ccba756f2---19053591986.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/sujotewalonigajirupaxij.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xuzegoxikubinagetuxodix.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/43539977207.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/78961590817.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/88034732491.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14256895476.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/papijejejame.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/27513181177.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/tadutaxujoxinitit.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/95472316613.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/wizibuganetojofeziruda.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/goxatatetasesagakaxoto.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/89083398923.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_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 18876 bytes
SHA-256: ea9cbe66cc84b588f4421db582ed1a956a8190031ef778e076b369c29da5caf4
font_01_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 10548 bytes
SHA-256: 4a9076a753b2e601642bd2023d72990d89649fca730fb4b34e4a6160a38601fc
font_02_sfnt_off000126b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1