Malicious PDF — malware analysis report

Static analysis result for SHA-256 83675be14713a994…

MALICIOUS

PDF

48.4 KB Created: 2020-04-09 19:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 265d4c25698331d7d50ab225c594c6c7 SHA-1: 09f9a5856b1dfdb5873c327f3b23b20db6623423 SHA-256: 83675be14713a994baed89a7ad12a72207b61b73260f2abac4caf0dcf36ff44d
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier with high confidence. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The document body, though heavily obfuscated, contains some of these URLs, suggesting the primary purpose is to redirect users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vo2life.com/uploads/1/3/1/3/131398526/131398526.html#enthan+devanal+enthan+devanal+mp3+fr
    • http://franklinmudhens.com/uploads/1/3/0/3/130313803/4512333.pdf
    • http://indiagvalentin.com/uploads/1/3/0/5/130543168/184d2.pdf
    • http://1318designs.com/uploads/1/3/0/6/130604467/modogadixed.pdf
    • http://queenbeebeauty.net/uploads/1/3/0/7/130740128/4725560.pdf
    • http://horserescuejewelry.com/uploads/1/3/0/7/130740617/8028618.pdf
    • http://holanomadas.com/uploads/1/3/1/4/131406722/2654778.pdf
    • http://vedvalmiki.com/uploads/1/3/1/3/131379792/fakozejaxo-jajaruvaferajaf-worolofiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fd9.bin
691c4c3c59598d58ff66fbd04becab1f3fab68840147a52d19e328817891074c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD9 20004 bytes
font_01_sfnt_off00009750.bin
815289fb1a8904b3c79845ba401169040ae88ce824911e507131056e8b29bf90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9750 6940 bytes

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