Malicious PDF — malware analysis report

Static analysis result for SHA-256 745c6a38416f1909…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 06:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 691ee6bca5aea71080742b60a727148e SHA-1: f3921084caced5b5890996ac312c53a31b696d86 SHA-256: 745c6a38416f1909f481428fd368091d21b6a37b7563811c70ca41aeb8b35c57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with a significant number pointing to disposable hosting and employing UTM parameters, suggesting a phishing or spam campaign. The PDF structure itself is identified as a link farm, indicating its primary purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://crysiq.ru/uplcv?utm_term=android+hacer+root PDF link annotation
    • http://rm-centr.ru/uploads/file/vunuzujuwazafajelasata.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/nisolikof.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/zemuxijijakomupusebil.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a64fba72f0---rolagubuzebafin.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/44355385171.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/66103983664.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/74806710708.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/suberelususab.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/97477724558.pdfIn PDF document text
    • https://ekransamara.ru/files/jenogemonipemikuzewoxara.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/wigoxabazoxonojasevuza.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/20b7cc9c3c934f657b631c2f27af2d6c/43339332393.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/zagewa.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/rugibikikepes.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/94384381980.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/munobunix.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/donamitobagebapup.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/sulujenajorijujoxu.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/buvogusiwipumenud.pdfIn PDF document text
    • http://bndweb.nl/upload/files/raxojuvipewigiganizofa.pdfIn PDF document text
    • http://gibisch.org/files/files/81275779916.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/90309720990.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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 18912 bytes
SHA-256: 46dbb894d6b9ce1a1887be5b8a37d72d6ebb65ac45b25a4cb32749693602ea51
font_01_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 10232 bytes
SHA-256: b28e9a8c4e1206553e2600d8f35e8eb62f108d199e8fddfa4f6109e4d4848039
font_02_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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