Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c8dbc6b60d6e36…

MALICIOUS

PDF

34.9 KB Created: 2020-04-16 12:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 325db55879034a81d820c8337c47f908 SHA-1: 600e9a86c70772414a63f4c829849618ac905890 SHA-256: 91c8dbc6b60d6e36b014d90a1b2e662efc5892d478a89a635f42f34bc7507c9f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm designed to manipulate search engine results or host malicious content. The primary URL points to a document titled 'warranty certificate format for electrical panel', which is a common lure for phishing or scam attempts. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://richkane.biz/uploads/1/3/0/6/130639790/130639790.html#warranty+certificate+format+for+electrical+panel
    • http://thethembaproject.org/uploads/1/3/0/5/130589315/badotasaxugow.pdf
    • http://kateleadleyfreelancewriter.com/uploads/1/3/1/3/131382607/e6bdd02.pdf
    • http://perisjewelry.com/uploads/1/3/1/1/131164180/d3eb558de6bd2.pdf
    • http://silkwormfarm.com/uploads/1/3/0/2/130274263/8392683.pdf
    • http://caccdevelopments.com/uploads/1/3/0/4/130435791/duvize.pdf
    • http://bremenfamilymartialarts.com/uploads/1/3/1/4/131407236/xesege_tivexodozu.pdf
    • http://frecklefaceboutiques.com/uploads/1/3/1/4/131454950/2490072.pdf
    • http://furnitruesoon.com/uploads/1/3/0/3/130379435/zovaborudejinexuf.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_off00006118.bin
a579644947a6046fedb8a1198a7104cdf95b9467f6a7c8e0c36831d9356a4238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 7808 bytes

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