Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd190afee074dc0…

MALICIOUS

PDF

77.3 KB Created: 2021-10-14 08:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0638ac23ff5ebeb8416b05651da3cf3e SHA-1: 7a6e96ff7c707c4359ba8c08465d960edaf259c0 SHA-256: 6bd190afee074dc06f6a2f30e0a6bd8433a062f925932b6a66f86c8a5da662ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction but rather to facilitate the exploitation of PDF vulnerabilities or to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ecohort.com/userfiles/files/nazuguzowovarine.pdf In PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/rawirofulisukopijewopod.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/5492421660.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/69747755741.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/rakazusuzi.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/31669820807.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/geroguwuzulikugeludetusu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161456a32b17c0---dofatejovilefu.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/58758902726.pdfIn PDF document text
    • http://hflchw.com/upload/file/19881500892.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/9038509479.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/93648269055.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/rupakekujosatava.pdfIn PDF document text
    • http://kultura-vyazniki.ru/sites/default/files/file/bosibixuxeloja.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/febamofokutegakexowilu.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/47024899811.pdfIn PDF document text
    • http://entrackintl.com/uploads/revusepuwomifirupura.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/78396277320.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/71765844810.pdfIn PDF document text
    • https://mlspoland.co/files/file/78596137085.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/bulegepidozose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/UsNeCLCzgYg/uplcv?utm_term=black+bird+with+red+and+yellow+tipped+wingsPDF link annotation
    • 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_off0000c8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B8 17172 bytes
SHA-256: 06e50c51eda794088c695248bf71468f51b5dc192aad9000b9da86937987b8d1
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 11276 bytes
SHA-256: 90530531c4c57be5116e350b2fe8b9952634a55293ab7ae1e7de6eb604a1f3a6

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