Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9741abb5293f8e…

MALICIOUS

PDF

34.3 KB Created: 2020-03-15 01:28:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5569aea6c4d9ece3351346597d0ada69 SHA-1: 924b87e6b019fd1b8db01c6cc764937a52e9299d SHA-256: 6c9741abb5293f8e813e4ed88e4770539be95dd8bc11cb0998807c17f55964b1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, forming a link farm, and specifically advertises a 'Cisco anyconnect vpn linux' download. The ML classifier strongly indicates maliciousness, and the presence of multiple external links suggests an attempt to redirect the user to a compromised or malicious site. The document's structure and content indicate a phishing or social engineering lure.

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://chuzhappy.com/uploads/1/3/1/0/131070525/131070525.html#cisco+anyconnect+vpn++linux
    • http://wkyautos.com/uploads/1/3/0/7/130775800/592056.pdf
    • http://dnreeds.com/uploads/1/3/0/4/130435503/295439.pdf
    • http://havemypeople.com/uploads/1/3/0/6/130621457/vegurot.pdf
    • http://drjohncasteele.com/uploads/1/3/0/2/130289692/wivokob.pdf
    • http://store.intertelek.com/uploads/1/3/0/6/130604604/8090169.pdf
    • http://74-123-72-124.mgwnet.com/uploads/1/3/0/6/130604031/743ab7.pdf
    • http://pitrend.net/uploads/1/3/0/2/130289530/1b5744.pdf
    • http://hostmaster.danfrenchillustration.com/uploads/1/3/1/1/131164187/vodin.pdf
    • http://preparetocare.net/uploads/1/3/0/5/130550812/gosenulobixo-vumiw-rojekawep.pdf
    • http://artdevinestudio.com/uploads/1/3/0/8/130873825/30724.pdf
    • http://anika-ji.com/uploads/1/3/0/4/130483184/gezanixov.pdf
    • http://root.belif.ba/uploads/1/3/0/6/130639369/penafakikarim_zadezidulenu_vinapenamalegu.pdf
    • http://mycusina.com/uploads/1/3/0/3/130313400/f51ed77ff984.pdf
    • http://zoolr.com/uploads/1/3/0/6/130620573/bapilifave-metotuz.pdf
    • http://www.chestwarmer.com/uploads/1/3/0/5/130588657/9388780.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_off00005e34.bin
f77f9afb3c17584350628db554255fe61414593d79cd39f5637d34e51774f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E34 7600 bytes

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