Malicious PDF — malware analysis report

Static analysis result for SHA-256 945b1ec5b79d650b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 07:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 29a21ba1b0e38bf195969c3f6e6b0642 SHA-1: 3a4c784dbd1d7cbefd8392c75dc91c6425b9ebb9 SHA-256: 945b1ec5b79d650b9f175ccf52c4ccb307aa61ed5dfea76be2ce6954519a17e3
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 a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=gta+vice+city+stories+iso PDF link annotation
    • http://bestorkate.com/uploads/ckeditor/files/58365131667.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/titobulaken.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/javixinuludakisor.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/23614386630.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/1853871580.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/turesonobomowo.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/gumewagiloduvawe.pdfIn PDF document text
    • https://yellowstonewildlife.com/nuzipuko.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/47057279986.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/pufijeba.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/35652030657.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/57468801461.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gededudubegine.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8d717059f4a7021fe841bc1dba0ca9ae/rafitene.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/27119493138.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/36755296233.pdfIn PDF document text
    • http://bushurov.ru/images/files/bulekenopinurujalifuniz.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/fonufajezo.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/7830869654.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/29023748248.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/797d82c7145895f08e318edbed51fe32/49667499287.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/wutituzizozorilowegox.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/90072591484.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_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 18092 bytes
SHA-256: f9d7a4aa71873a3e1db4b14ecaacda49072416b45c05f47f7fe2d2fe5342bacd
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 10292 bytes
SHA-256: 4a986e76ea0d5de2c4ee9ce4977c899f2b4ef1932ba044f01de5665d5b8523a4
font_02_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1