Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b9fde83ba9c663…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 17:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5913d135105071a9085f74fada1c5ae SHA-1: 60d42967754f3483650b6cec1044368160ff1e22 SHA-256: f5b9fde83ba9c663b32e8c852a962d6f26cd6aea57ed5ce5f257702fb557b918
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'synerhu.ru', which is likely part of a phishing campaign. The PDF structure and embedded links suggest it's designed to lure users to malicious websites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=es+file+explorer+ntfs PDF link annotation
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/72994275582.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614780db1a185---berajalogituli.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/2354781667.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/gekimavataziwosufola.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/varisalam.pdfIn PDF document text
    • http://toroisg.com/public/images/files/marala.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/94115260122.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210918120522.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/goguruwinirenavorasekumi.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/noregipuvidufizanok.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/siviwivebubokapinarowe.pdfIn PDF document text
    • https://jin-ji.com/upload/files/danasodigokeb.pdfIn PDF document text
    • http://quinta.cl/upload/files/99716364321.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/63525297033.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///64076245903.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dd80dd2c7---60049537466.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/garusuwusag.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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 10276 bytes
SHA-256: 028483537f2ca34c82495e93e056f70ed5cb8051d1aeb1b6f1a4c4e6a3d518d6
font_01_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 17468 bytes
SHA-256: 03b18747edb7050a84ed08bb23e37bbbe86e519d9fecab068e2e5fecc820ddff

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