Malicious PDF — malware analysis report

Static analysis result for SHA-256 060132e0a7d5e643…

MALICIOUS

PDF

39.8 KB Created: 2020-03-31 00:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4c6c7364260a99db106d06cbc29334d3 SHA-1: 86e5ca8c2dd5e5799b4ab594c111f379489d6640 SHA-256: 060132e0a7d5e643086b7e9fa2b5ec9c65f066bc101e14f78ca19e76c9141a59
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though partially corrupted, contains a reference to '3 ejercicios de tiro vertical resueltos faciles' and the authoring application 'wkhtmltopdf', suggesting a lure document. The primary attack pattern involves directing users to a link farm, likely for SEO spam or to host further malicious content.

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://aoiiosu.com/uploads/1/3/0/6/130639298/130639298.html#3+ejercicios+de+tiro+vertical+resueltos+faciles
    • http://fighting4wayne.org/uploads/1/3/1/0/131070187/62ce89c154f.pdf
    • http://kabbashartisan.org/uploads/1/3/1/0/131069934/kisofital_xudokareganetor.pdf
    • http://hthnails.com/uploads/1/3/0/2/130272905/zomokufibo_womenifa_pegirubepuvep.pdf
    • http://theultimatecruiser.com/uploads/1/3/0/2/130291783/fad7abeb.pdf
    • http://carnegieam.org/uploads/1/3/1/0/131070485/tapenanojetexasew.pdf
    • http://tahoescribe.com/uploads/1/3/1/0/131069987/facaa27.pdf
    • http://propertiesbypaula.com/uploads/1/3/0/7/130775358/dobisujotu_dovexasasubobeg.pdf
    • http://kineffect.com/uploads/1/3/0/7/130739103/9724337.pdf
    • http://fencingaberdeen.com/uploads/1/3/0/2/130289354/4687340.pdf
    • http://keeptrumpin.com/uploads/1/3/1/0/131070786/zubilujajigil_tiwinog.pdf
    • http://great8baseball.com/uploads/1/3/0/5/130589048/vuvofojezekela_kopimafiwepix_paxeworobewabil_vudoridaz.pdf
    • http://myfitrepub.com/uploads/1/3/0/5/130589156/656391.pdf
    • http://m2nphotography.com/uploads/1/3/0/4/130483852/xiwibiladega-niluvibimeg-towop-tarimab.pdf
    • http://nwspecialtylumbermill.com/uploads/1/3/1/4/131407668/guwadedumetuneni.pdf
    • http://sdhiphopevents.com/uploads/1/3/1/3/131383821/8046812.pdf
    • http://esportsak.com/uploads/1/3/0/8/130814576/dixexozoditodaj.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_off00006bf0.bin
8f73b06e65b0adeba72a4ce03a2ba83d8285807d5786b924486e97dc1992d495		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF0 10120 bytes

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