Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac35e07cf235711a…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 23:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6c9423eae505013e47b8c6428f9d3bd4 SHA-1: c757a077f5d1c683e38b8152baeb539579f7cdcc SHA-256: ac35e07cf235711af1d75d397e3731b2dc96c129b316a2c43fcf551036261465
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=how+to+install+facetime+on+android PDF link annotation
    • http://zagazzo.com/userfiles/file/pilitamanowasavokawos.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/rurigonowubevetefagimara.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/gizukenenakaru.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/27fd0dfb44502c3aec09fa8210680f3f/93191771916.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/76500612908.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/2250969466.pdfIn PDF document text
    • http://bptramptour.pl/files/file/nexizovexetenevut.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/wimikuzodutolikupojural.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/tonezu.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/wudexafigasajodagobazof.pdfIn PDF document text
    • http://makaroma.fr/upload/file/47321944093.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/37426187102.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/9885407323.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/23709963198.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/59541727201.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/69152598759.pdfIn PDF document text
    • http://autovoda.ru/upload/files/54887486480.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/narizu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6f1422fa3e9eeb8a44acf743d29499cd/63641930187.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/lusetabofuxesibiji.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/12202858089.pdfIn PDF document text
    • http://xfswchem.com/upload/files/wevon.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/96813225479.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_off0000b24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24C 17136 bytes
SHA-256: e0e9df5569f8dfbc8b7bde2322c56dd2f9687cc324fc2c696125d8ea43d6313c
font_01_sfnt_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 10712 bytes
SHA-256: 47b6f7820d48610def9a578d5bc6afe7c7765ec8958c0b05acc55a6f12e9393c
font_02_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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