Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bec624045956f3…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 02:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d591b92d6626cfc0ac5b36a23e743fac SHA-1: bd71b883e0f074570508aa6eb9d335ada2d68da7 SHA-256: a2bec624045956f32216256ee42df19788f9a523dfd326857514a4105cdec832
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. It contains numerous embedded URLs pointing to other PDF files, indicating it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this behavior, suggesting a tactic to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.afurg.com.br/assets/ckfinder/userfiles/files/30347112465.pdf In PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/vuxoxewutaxomiwe.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420a123a622---vilinemisokekirus.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/lebirazazo.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/64423247947.pdfIn PDF document text
    • http://dejede.com/userfiles/file/popenegoburok.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/zalalalozuxutur.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631738697852391934.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/006f476157181d34ee46fce5369c8fe8/lasufelogalijasufilovuvaj.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/29019426526.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/wegexotuvemam.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/rofalimojivesowopagabame.pdfIn PDF document text
    • https://businesslife.com/content/file/26597429630.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/nuwegewozofasubonojorune.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109022011456385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+extract+apk+from+installed+appPDF 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_off0000c975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC975 17556 bytes
SHA-256: 6b35049d8198f627cb37b8ed3de205a9e5d038a2ef6e98e24b4ed730db616cb3
font_01_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 11052 bytes
SHA-256: e7794fcbbda501393c97958397e3baddb872e2f8734bd8c46964b24d1011c8cb

Open this report in the interactive analyzer, or submit your own file for analysis.