Malicious PDF — malware analysis report

Static analysis result for SHA-256 494694f9f55bafc3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 21:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e4f41e6779c8bebbb8d7b7682696701 SHA-1: 8f49d8358c7047fd4b4040ff9bbd38b5a20f6fbe SHA-256: 494694f9f55bafc3d2865232285e85a7ad1b8903a0e16e579d50c3b9412bafd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=code+complete+2+pdf+github PDF link annotation
    • https://etadelloro.it/images/file/65805593716.pdfIn PDF document text
    • http://sb-78.ru/files/file/kewalibumujutabasoloxuf.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/gepovavenipeveguxu.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/zijozesujulikekonatepu.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/50619971057.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/vawusejinawemeb.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/bojiwatimi.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/gamegow.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/96160667256.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/zewesaregejududoxawenefar.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/3398370094.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f2jmvebjopbh6ve4vcei5mvsl7/34244665457.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/juloxufutewitum.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/laluvafuwawanufokuz.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/22771346045.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b87bed5b91b---zotoxinepuvuvalokes.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/89979406430.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/1250957956.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/xunezipedoxumadasuzigum.pdfIn PDF document text
    • http://pediatricpotentialsnj.com/PP/PPpng/files/vuzaj.pdfIn PDF document text
    • https://menu2uplus.com/images/file/24731345705.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210510105523_1312173546.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_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 19104 bytes
SHA-256: 274bba037fd067589becf44004fe0d809d9c9603d953c15cc30b3e29ddcd6f61
font_02_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 10924 bytes
SHA-256: c6054f5782cb2e1abf20720ad056fea1ab1ed9451380cbdee8197a97fb4902d2

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