Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35eef9d08d12df8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 15:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07695d0bea36d1544b9ab6d76971885f SHA-1: d75cbee45caeb406794e61961c69d93d58dcbdd4 SHA-256: d35eef9d08d12df8188e3fd1fb908c0648f9c78fd662d66b97caa21ebad94e53
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. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=map+application+for+android PDF link annotation
    • http://tencanpowder.com/d/files/dirujufavobof.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/pujilu.pdfIn PDF document text
    • http://knipia.com/userfiles/file/66656802240.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/sevozibufunekurawazid.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7e165661---13201461670.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/sufimeze.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210914_174744.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/81034776394.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/83674708325.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gituvevi.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/98512565886.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/66680768536.pdfIn PDF document text
    • https://majubesar.com/contents/files/87118548592.pdfIn PDF document text
    • http://baove24h.info/upload/files/rovixapopas.pdfIn PDF document text
    • http://eternaseguros.net/files/files/57308308101.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c42b6d81---7191901119.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/8676084662.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/keduzelakukizapinos.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/xarejinogur.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/bopabi.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210920032400.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210920_064424.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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 18732 bytes
SHA-256: b825dcfad782b8f3986903775d31799b879d53c023c5ab5004957570c6313d33
font_01_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 10308 bytes
SHA-256: f8f2ec2cdb0861d201bf32b8cdeae5cbe10eabeef4c61cb60cd531816748ae87

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