Malicious PDF — malware analysis report

Static analysis result for SHA-256 937dbba2e29c59f1…

MALICIOUS

PDF

40.0 KB Created: 2020-06-05 09:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21f068971b89528fe64e441ff96883c6 SHA-1: d2e745216bbb6f95681c61f09c9f513f40ee972e SHA-256: 937dbba2e29c59f1dc481933fda907902ad327228d8489a489e2ce6b32f61a6a
96 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier. It contains a large number of external links, many of which point to PDF files hosted on various domains. The document body, though heavily obfuscated, contains text related to a 'Branson 4520 tractor owner's manual', suggesting a lure to disguise the malicious intent of redirecting users to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mobile-brakes.com/uploads/1/3/0/5/130544313/130544313.html#branson+4520+tractor+owner%2527s+manual
    • http://landscapingathens.com/uploads/1/3/0/6/130621646/zovorenatokasuv_kafudadoviki.pdf
    • http://therussianstudiospa.com/uploads/1/3/1/4/131437490/3e75c90f8.pdf
    • http://cpanel.sjsbp.org/uploads/1/3/0/6/130604501/2738654.pdf
    • http://shepherdjrotc.net/uploads/1/3/1/4/131453219/4432603.pdf
    • http://adamchandlerdouglas.com/uploads/1/3/0/3/130313242/3ae39e8bf5.pdf
    • http://edinamann.com/uploads/1/3/0/9/130969722/214c8d5db.pdf
    • http://mobile-brakes.com/uploads/1/3/0/5/130544313/terms.html
    • http://mobile-brakes.com/uploads/1/3/0/5/130544313/dmca.html
    • http://mobile-brakes.com/uploads/1/3/0/5/130544313/policy.html
    • https://viditesu512119844.files.wordpress.com/2020/06/25383662627.pdf
    • https://lewoxosi.files.wordpress.com/2020/06/4105033606.pdf
    • https://xujonajodezo.files.wordpress.com/2020/06/xotowewokulimadewibuveb.pdf
    • https://dafuxuli.files.wordpress.com/2020/06/mozelokukokobilozefotek.pdf
    • https://sabuninovaju.files.wordpress.com/2020/06/94164496015.pdf
    • https://jefofim.files.wordpress.com/2020/06/tosuwagasapepi.pdf
    • https://nizekifu.files.wordpress.com/2020/06/25237165996.pdf
    • https://romosalad296976854.files.wordpress.com/2020/06/dadesufofenono.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c08.bin
bcb5e1842b1dee9b1d6bc1e50def0247673eb8938f75ca1b1edfdafef1ca2b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C08 12400 bytes

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