Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a050295af974537…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 19:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e86b0cd29b4cfe13b96770edf213b8c7 SHA-1: 8ab13801c0d03b3641fd4c3daf0ee9e7f76e9d5e SHA-256: 9a050295af974537ebaedb5f41aac46e31b98e42998fe5b60cc87bbf8d7f49a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=off+road+4x4+mod+apk PDF link annotation
    • http://air-con.ru/upload/files/94709914472.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/64436825765.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/30406114635.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/75179953432.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/36809169913.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/19297572175.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/visiloba.pdfIn PDF document text
    • https://ferropula.hr/files/91551174279.pdfIn PDF document text
    • http://www.centralperdana.com/file/86992456056.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/danin.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/zopiboj.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/45612004.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/34994732920.pdfIn PDF document text
    • http://telecycling.info/files/file/pidenakoditilevudomenanif.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/84069414932.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/77765132745.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/74370998451.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/wizogosakurovut.pdfIn PDF document text
    • http://parentini.it/userfiles/files/kurugif.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210916150057.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_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 10316 bytes
SHA-256: f993a8a16219ec4941462dc1a283a2fabff2b8c000275c777e729f2dbced095e
font_01_sfnt_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 18260 bytes
SHA-256: a214b43ee2499e4963cbf425cc0922c8f59bbf5a8cb3fdd12d3847a8ae692c1c
font_02_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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