Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd49fdcf065625b…

MALICIOUS

PDF

30.1 KB Created: 2020-04-06 10:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c8815c95a27030a35d831a7cafacdcd SHA-1: 4714f65ea98c5968632b19bd370c5024df549b6b SHA-256: 4fd49fdcf065625b77dfe3f1bb9b0d44ca2cf9ec70f5a55afaf1a34f0f87ab1b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text that appears to be a lure, and the numerous URLs suggest a link farm or redirection to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://slammernation.com/uploads/1/3/0/7/130776854/130776854.html#ants+in+the+apple+lyrics
    • http://garagedoor-repair-bothell-wa.com/uploads/1/3/0/8/130873787/rewani.pdf
    • http://ward3onlinegames.com/uploads/1/3/0/5/130551416/likezalar_zuxojobiz.pdf
    • http://bigjuicyslices.com/uploads/1/3/1/1/131164558/18a305737d6af9c.pdf
    • http://mna-photography.com/uploads/1/3/0/5/130590700/rejiduto.pdf
    • http://carlocolettibodywork.com/uploads/1/3/0/5/130545098/9684334.pdf
    • http://monicalass.com/uploads/1/3/0/7/130738673/kobefotesibele_rasodafada_tofefijimunir_ludisutomirap.pdf
    • http://mychickadeesfuntasticnest.com/uploads/1/3/0/2/130270831/fafumapesijag_tedexiwuz.pdf
    • http://allsolutionsconstruction.com/uploads/1/3/0/6/130620690/8fa2b1c8.pdf
    • http://tclifeht.com/uploads/1/3/0/6/130621498/6996295.pdf
    • http://referralroulette.com/uploads/1/3/0/7/130775520/1427101.pdf
    • http://masteryourownthoughts.com/uploads/1/3/0/2/130289375/popezitubirat_zokem_wivixabupoxefis_gides.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_off0000505f.bin
e50c69c938b9eecd6488f27a77f2497e274b72a09f9b187d9a82408e12187eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x505F 6880 bytes

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