Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b892edaeb70a7c2…

MALICIOUS

PDF

34.8 KB Created: 2020-04-30 00:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bae71bc5c8082274c8ec5f5451b0c517 SHA-1: 786026699588c4cb420f3de55412c6612f93cc31 SHA-256: 6b892edaeb70a7c27c7f50d1694ffd959e93b055d3b173dd0f3c7f25cca11a38
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous embedded links to external PDF files, a common tactic for SEO link farms and potentially for hosting malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further suggests a user-interaction-based attack. The primary URL points to a file that appears to be a lure for Cisco Webex Player, likely intended to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gatechguy.com/uploads/1/3/1/3/131398559/131398559.html#cisco+webex+player++for+windows+7
    • http://judithstephens.com/uploads/1/3/0/2/130289322/titivobaxivupo_supusalutupe_metaza.pdf
    • http://lifeandlandscapesphotography.com/uploads/1/3/0/6/130621094/wanuzizojajako.pdf
    • http://9f60dmh001.com/uploads/1/3/0/2/130288864/2453302.pdf
    • http://mhromano.com/uploads/1/3/0/5/130551586/3455803.pdf
    • http://ehswildcatfootball.com/uploads/1/3/0/3/130379902/a77d8.pdf
    • http://dear-eva.com/uploads/1/3/0/8/130814562/1473774.pdf
    • http://trever-condo.net/uploads/1/3/0/5/130538981/baromatad.pdf
    • http://jewlsbyjess.com/uploads/1/3/1/4/131453288/tezudanof_xogaxilezan_konivug_newememepikun.pdf
    • http://transformationalhealingretreats.com/uploads/1/3/0/7/130776841/kenuseko.pdf
    • http://patriotnrr.com/uploads/1/3/1/3/131379919/1406926.pdf
    • http://reusemarble.com/uploads/1/3/0/5/130551823/bijepibajedofulab.pdf
    • http://thedmcihomes.com/uploads/1/3/0/4/130476317/jidubikupajez.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_off000061c8.bin
9f71685074c9d6f151fc4b76b324230a44ac35d5c99d384483e574289a530446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C8 7428 bytes

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