Malicious PDF — malware analysis report

Static analysis result for SHA-256 c572b81766851e36…

MALICIOUS

PDF

40.7 KB Created: 2020-04-05 11:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ad01dafd16351e373c7504b52795faf SHA-1: df7bd5174a0b398f7164391533e9e2168f64641c SHA-256: c572b81766851e36c62461253e39f821e73d4ea2136b72a5260d356e237613ab
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO poisoning or link farm attacks to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to Excel formulas and references the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. No scripts were extracted from this sample.

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://psiquilibre-pilatestudio.net/uploads/1/3/1/4/131483336/131483336.html#formula+condicional+excel+si+contiene+texto
    • http://mdexpertwitness.com/uploads/1/3/0/7/130739214/toverifoforuj_desesunami_nemekoza.pdf
    • http://sbafunds.net/uploads/1/3/0/6/130604045/787d609.pdf
    • http://centreforpeandsport.com/uploads/1/3/1/4/131406813/budifobofimevedarogu.pdf
    • http://jamesmarshallporterjr.com/uploads/1/3/1/0/131070336/9293728.pdf
    • http://kairodesign.com/uploads/1/3/1/3/131383839/7828904.pdf
    • http://novelcritques.com/uploads/1/3/0/4/130493714/d097bfb26ef0620.pdf
    • http://jaycostanzaart.com/uploads/1/3/0/3/130323328/98f77c2ba.pdf
    • http://familylifecommunity.org/uploads/1/3/0/6/130620542/kitajojefi.pdf
    • http://mistersack.net/uploads/1/3/0/7/130775554/jiteba.pdf
    • http://thefadeschool.com/uploads/1/3/0/4/130435784/68955e748f913.pdf
    • http://teapartycoop.com/uploads/1/3/0/6/130639655/7269537.pdf
    • http://sweetephotos.net/uploads/1/3/1/4/131414516/dilovuxe.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_off00007090.bin
09311b1053ea28c2249543320f64d7bba97eeb9254a4b5740b07c4cb5091e58c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7090 9860 bytes

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