Malicious PDF — malware analysis report

Static analysis result for SHA-256 413e8c23aa36e645…

MALICIOUS

PDF

47.0 KB Created: 2020-03-29 06:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca5d6f1b600b4ee0f41962b6e5963b92 SHA-1: 8673fab2d9f4c1547f95c472fb66d4404b77847b SHA-256: 413e8c23aa36e64599af6627bac2de9c4ecb47014868d524d2cd413b52009948
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, contains text related to survey error margins and references the wkhtmltopdf tool, suggesting a potential lure. The primary attack pattern involves redirecting users to a multitude of external URLs, many of which are PDFs themselves, 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://seastar.websalve.com/uploads/1/3/0/7/130776646/130776646.html#calculo+del+margen+de+error+de+una+encuesta
    • http://craftalausdidmena.com/uploads/1/3/0/6/130605194/7a739700aefc193.pdf
    • http://amongotherrunners.com/uploads/1/3/0/4/130475877/vasutotuxupogu_voxop.pdf
    • http://azzurraweb.net/uploads/1/3/0/3/130379769/gufaputunojifo.pdf
    • http://markzelmer.ca/uploads/1/3/0/7/130739119/ff1651822d8cc9.pdf
    • http://problematticpod.com/uploads/1/3/0/5/130551267/0affa35a81bea7.pdf
    • http://webdisk.johngloria.net/uploads/1/3/0/7/130739686/jotila-borut-wamazi-lilexegifopexop.pdf
    • http://deardoc.org/uploads/1/3/0/8/130814112/f88ee4.pdf
    • http://miguelchanonafotografo.com/uploads/1/3/0/2/130271114/1fb3b3fe6f.pdf
    • http://precominc.com/uploads/1/3/0/2/130272638/lebalili.pdf
    • http://kinniclay.com/uploads/1/3/0/7/130739923/pisifikaxumozoxagab.pdf
    • http://transformingnextgen.com/uploads/1/3/0/2/130270887/2667893.pdf
    • http://caitlinmorrison.com/uploads/1/3/0/6/130639479/motes.pdf
    • http://dronequestcomplex.com/uploads/1/3/0/2/130291475/1493794.pdf
    • http://princesstentsoman.com/uploads/1/3/0/8/130873921/tenodeta-dobakarujivej.pdf
    • http://sinfoniacam.com/uploads/1/3/0/8/130814672/4c982378.pdf
    • http://glasskye.com/uploads/1/3/0/5/130589322/3c396845568a.pdf
    • http://www.lakesuperiorcreates.com/uploads/1/3/0/2/130289466/7045742.pdf
    • http://www.ideolize.com/uploads/1/3/0/8/130873994/tizajigalajatat.pdf
    • http://foreverroyalinc.com/uploads/1/3/0/7/130740146/fivem.pdf
    • http://neaod.com/uploads/1/3/0/8/130813732/09093800d3.pdf
    • http://phillbriscoe.net/uploads/1/3/0/6/130621917/beed9bee.pdf
    • http://yourluxurysuv.com/uploads/1/3/0/6/130620393/3197936.pdf
    • http://savoiedelacy.com/uploads/1/3/0/5/130588802/0d3eebf0bf4.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_off000082e8.bin
8924de6325be7f5e82d0a7327848250681f9db32c1d290bc339b8195b8e337ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E8 8416 bytes
font_01_sfnt_off0000a1a4.bin
453fb7942731013dcab42868264a9be19bd099a1032bb61405edb9d98f7c3022		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A4 2840 bytes

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