Malicious PDF — malware analysis report

Static analysis result for SHA-256 b857112d45480e0a…

MALICIOUS

PDF

43.0 KB Created: 2020-03-24 20:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0eb9d361e2261b6f1e619f56fa4751c7 SHA-1: 316f3852dc59343b67bcbb99db6bc8197682bf6c SHA-256: b857112d45480e0af6877b420e96fdba208a1823941b60e6a9b5d289c7bfbaf2
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to the URLs, reinforcing the attack pattern. 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://chandlerbreeart.com/uploads/1/3/0/6/130639251/130639251.html#tipos+de+ceramicos+que+existen
    • http://buzzwire.live/uploads/1/3/0/6/130620402/jusevewipo-kelozofi.pdf
    • http://www.granberg.us/uploads/1/3/0/2/130270982/vowajiji-pimufokenejiv-lofubunuditi-wupexatarivodoz.pdf
    • http://mrsparsons.net/uploads/1/3/0/4/130490218/zoteku.pdf
    • http://webdisk.pulsefitnessmandan.com/uploads/1/3/0/4/130490193/kasidewudiletojome.pdf
    • http://crossrider.info/uploads/1/3/0/4/130483248/3165511.pdf
    • http://caneevino.com/uploads/1/3/0/4/130483680/8a23f47ff061.pdf
    • http://v8france.com/uploads/1/3/0/5/130545021/2357259.pdf
    • http://sostenibilidaddelmenor.com/uploads/1/3/0/3/130323422/59960d646f074.pdf
    • http://www.sportiv-expert.com/uploads/1/3/0/3/130323997/41b85.pdf
    • http://sbsnowclub.com/uploads/1/3/0/3/130323900/jejav_gifuvuz.pdf
    • http://www.southlakesphoto.co.uk/uploads/1/3/0/7/130740441/murofugero.pdf
    • http://metaconference.org/uploads/1/3/0/7/130738632/votilavojopox-forovalazimula-vumase-ragasolomigugek.pdf
    • http://mouseandcastle.ca/uploads/1/3/0/4/130483086/b385fab37c.pdf
    • http://mowriteindustrial.com/uploads/1/3/1/0/131070523/guboluxiw-mivixutimamisa-kizokobewafep.pdf
    • http://youarenotaloneart.com/uploads/1/3/0/7/130776008/vewojebumadema.pdf
    • http://fichthornpsu.com/uploads/1/3/0/7/130775211/zapewabumobe.pdf
    • http://nadzorybudowlane-arles.pl/uploads/1/3/0/3/130313066/naforolexumu_nezad_zaxudebaxof.pdf
    • http://findingabilityinlearningdisability.org/uploads/1/3/0/5/130550891/javisezabo-toxizuludumorul-vawegonitadit-zufel.pdf
    • http://www.floor2wall.com.au/uploads/1/3/0/7/130740077/zuworoze-vunevovazezora.pdf
    • http://ajochinger.net/uploads/1/3/0/8/130813403/sexafekilobisu_vawuvedejikev_valimat.pdf
    • http://mail.matamorosonline.com/uploads/1/3/0/7/130775853/jabafasaf.pdf
    • http://mxdeinvxginx.com/uploads/1/3/0/6/130604085/aa45ca9de5.pdf
    • http://elevatedcontracting.net/uploads/1/3/0/6/130639954/zakadegevubojixil.pdf
    • http://mxdeinvxginx.com/uploads/1/3/0/6/13060
    • 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_off00007453.bin
db52ecd9eca0199551c9d3d6be9ab303fb4590642d17eae052dc289e7d615f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7453 8584 bytes
font_01_sfnt_off00009379.bin
1313c42514c5e2c39ac4962aa9a5e54dbb84ed9285b79088695fcf755539dff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9379 1872 bytes

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