Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ef477d646bc1df…

MALICIOUS

PDF

40.8 KB Created: 2020-05-18 09:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2673e17e3f48445f90669ac36945c874 SHA-1: c2727e5c5765fe7de9d38b4b0bba4a2c74111147 SHA-256: b5ef477d646bc1df1b8a8284a0d110280c868a3292014e0ef7c493761d94d04e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, indicative of a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to drive traffic to these external resources. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://wagenselleryoga.com/uploads/1/3/1/3/131380720/131380720.html#cardiopatia+congenita+cianotica+y+acianotica+pdf
    • http://palimagesphotography.com/uploads/1/3/0/6/130620341/1271115.pdf
    • http://freedommedicalassociation.com/uploads/1/3/0/6/130603979/92fc2fb025e9df4.pdf
    • http://modernenergygroup.net/uploads/1/3/0/2/130274338/motiseteraki_menumowisub.pdf
    • http://jeaniouslab.com/uploads/1/3/0/6/130621839/gubuvaresebasov.pdf
    • http://lizmonasky.com/uploads/1/3/1/4/131406934/buvobuzubad.pdf
    • http://memorystones.ca/uploads/1/3/0/5/130543087/a3272.pdf
    • http://povertytopowerhouse.com/uploads/1/3/0/6/130621196/biziva.pdf
    • http://oakvilleklosterschule.com/uploads/1/3/0/6/130621926/74bcac5be566d.pdf
    • http://troop2205gtx.org/uploads/1/3/0/5/130546880/0e6f4f87845.pdf
    • http://andysmoles.com/uploads/1/3/1/6/131606491/wafikikevi_pejok.pdf
    • http://humanfactoryconsulting.com/uploads/1/3/1/4/131453402/tuwukulisuzu-jewarenaduliso-powixeve.pdf
    • http://micahfenton.com/uploads/1/3/0/6/130639077/2626588.pdf
    • http://shikoraexpress.com/uploads/1/3/1/1/131164009/gezixolorosurapoweri.pdf
    • http://octhome.net/uploads/1/3/0/9/130969372/kobebezixovawor-kavemosofaj-selozovazexuw-setodinoxin.pdf
    • http://kasnia.org/uploads/1/3/0/7/130775169/xozopa.pdf
    • http://andershanberg.dk/uploads/1/3/1/4/131437319/lidoruketa_rorojutos.pdf
    • http://ewelectrical.com/uploads/1/3/0/5/130543087/aae4c.pdf
    • http://thehideoutdeal.com/uploads/1/3/0/2/130287401/zilepewat.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_off00006f2b.bin
3eb69e4e54ec686dd9d8a78a5c28e796d76cae002e397181bca29c4bb4494736
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2B 12824 bytes