Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6926904bda6817e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-14 20:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 111d12f31559f9beb10f0b3228fe7e9b SHA-1: 6a7c3c3fa8f0c70920cbd010d6dbf18348e871fb SHA-256: e6926904bda6817e97864c30c1cc98cf23f79c4345f40ad4afb9f2ed8a248d52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests this is a common tactic for SEO manipulation or distributing further malicious content. The presence of many distinct, potentially disposable domains hosting PDF files reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://toshiteriyakiburien.com/uploads/files/wujilowomikatorujigudex.pdf In PDF document text
    • http://cserepakciok.hu/xdata/file/42727338636.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/24852434700.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/95587582334.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/wazuzej.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/79159763404.pdfIn PDF document text
    • http://tencanpowder.com/d/files/73048284156.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/tukepomuxibebize.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/95193406599.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/68301694083.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/13440166716.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/54722334483.pdfIn PDF document text
    • https://stopserv.ru/files/file/69751927023.pdfIn PDF document text
    • http://espicycooking.com/files/file///tutudemufofugaxowox.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/51587595637.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b325d0c2de---visexegipuni.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/63795434750.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/20652681047.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/33919767506.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/jelorefuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bollywood+movies+filmyzillaPDF 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_off0000b0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 10592 bytes
SHA-256: 0abd8c996d359cc2ddb4b1b567247050e417000f53b7635fbd1b0c42a2a1cdeb
font_02_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 15360 bytes
SHA-256: 1cabb5b9ef28b4a3ec090bb42dd22b75d803d78a1d559111c3854a747af95fdc

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