Malicious PDF — malware analysis report

Static analysis result for SHA-256 496b0cc1fd06f5a0…

MALICIOUS

PDF

37.6 KB Created: 2020-05-30 06:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbf400116fe8ca44bad940e727047a9b SHA-1: ded1e412334e80aa3a21e1a7e15e74169bb95fd2 SHA-256: 496b0cc1fd06f5a0801db9ff41b2d1cf18302b2e7df967970f9cb7ec497c47db
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to improve search engine ranking for unrelated content. One prominent link, 'http://thepresetribe.com/uploads/1/3/1/3/131383441/131383441.html#fvdi+abrites+commander+software+download', suggests a lure for downloading software. The ML classifier strongly flagged this PDF as malicious, supporting the interpretation of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://thepresetribe.com/uploads/1/3/1/3/131383441/131383441.html#fvdi+abrites+commander+software+download
    • http://designkimhornburg.com/uploads/1/3/0/8/130813769/nisavatarogi-lodis.pdf
    • http://tedxyouthcvf.com/uploads/1/3/1/3/131380344/1265601.pdf
    • http://mta-sts.mx.pwdchicagoclub.org/uploads/1/3/0/7/130738984/dobiru.pdf
    • http://posh-shh.com/uploads/1/3/0/2/130272389/xupimakibemikofi.pdf
    • http://crohnsandcolitiscollective.com/uploads/1/3/1/4/131438356/5694949.pdf
    • http://evetheatrelouisville.com/uploads/1/3/0/2/130270912/9003620.pdf
    • http://frontporchdwelling.com/uploads/1/3/0/2/130287866/5f5ed7f54.pdf
    • http://runningwildinflatable.com/uploads/1/3/0/6/130620691/2233461.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_off00005c95.bin
f725b616a1add9e943c6eb4fb6e7c9f4993d2e6aee03ef0522a7e9ab2836f318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C95 2912 bytes
font_01_sfnt_off000066eb.bin
d9a6a14bbf7e0a3da095343061c01773d980ec3f4766d6b5301823d2440f183a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EB 10572 bytes

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