Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7fcba538720b8b…

MALICIOUS

PDF

41.2 KB Created: 2020-04-14 08:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e01f6c1d4f2eeeafea3b4dca9f51300c SHA-1: 07d56bad6be580083b386922772966fb587020c1 SHA-256: 2f7fcba538720b8bd77e9f11c64cd1a4c1b2dbe48a8d521abb990558c578df7f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The document body, though partially corrupted, mentions 'Cbse improvement exam 2019 online application form', indicating a lure to trick users into clicking on the embedded malicious URLs. The ML classifier also strongly flagged this PDF as malicious.

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://ivansiqueira.net/uploads/1/3/0/7/130776082/130776082.html#cbse+improvement+exam+2019+online+application+form
    • http://3170gordondrive.com/uploads/1/3/1/3/131398606/24a224.pdf
    • http://cigarsandmasonjars.com/uploads/1/3/0/5/130550770/kutofifomitaka.pdf
    • http://werthlivingphotography.com/uploads/1/3/1/4/131438474/8790560.pdf
    • http://coolventacs.com/uploads/1/3/1/6/131607053/d71f1b03433b90.pdf
    • http://rodgerssound.com/uploads/1/3/0/7/130775786/f3e6065.pdf
    • http://brandtvvs.se/uploads/1/3/0/7/130776220/zawinaperejedal.pdf
    • http://twoteachersabroad.com/uploads/1/3/0/3/130313388/334a34.pdf
    • http://abglegal.com/uploads/1/3/0/5/130550976/mumejosulup.pdf
    • http://wmd2612.org/uploads/1/3/0/7/130739090/2628817.pdf
    • http://www.daltongeorgeauto.com/uploads/1/3/0/9/130969476/dakobe-tenufiwex-vigeruxujezugos.pdf
    • http://mariahmichelle-portfolio.com/uploads/1/3/0/6/130604218/walidozokelim.pdf
    • http://lafotografas.com/uploads/1/3/0/7/130775181/giseverimi.pdf
    • http://hackrome.ezecute.com/uploads/1/3/1/6/131607230/fusofosewepamojeg.pdf
    • http://trtidalwave.com/uploads/1/3/0/5/130546354/kogir.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_off000078c4.bin
b70354b0e08c4501625ba9f5cfb1e3b2e458532f676f099acff57cc31c2e6867		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C4 8116 bytes

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