Malicious PDF — malware analysis report

Static analysis result for SHA-256 703940243acf4520…

MALICIOUS

PDF

39.3 KB Created: 2020-03-30 12:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4bc1437bf6b6f061dd426b6c74f17213 SHA-1: db91260b933fe5cf79dda4309cef584950e51f0f SHA-256: 703940243acf45203a9efc251dbb3e0951a9e7af5e1c5e3bb9e05ee4fb985ca4
96 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a mass of external PDF links. The document's content and structure suggest it is designed to drive traffic to these external resources, which could host further malware or phishing content.

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://5pointauto.com/uploads/1/3/1/3/131383251/131383251.html#plano+medio+close+up
    • http://moitruonghanoi.net/uploads/1/3/0/6/130621210/buwojone-desan-tewekodisezom.pdf
    • http://spiel-essen.com/uploads/1/3/0/5/130590325/38a56b10.pdf
    • http://nileshsp.com/uploads/1/3/0/6/130621664/3838605.pdf
    • http://myhiddenboutique.net/uploads/1/3/0/7/130775395/8588119.pdf
    • http://vote4haymour.ca/uploads/1/3/0/6/130639965/lunozegu.pdf
    • http://yourmedicareadvocates.org/uploads/1/3/0/4/130476830/mutudasozak.pdf
    • http://webdisk.wroeh.org/uploads/1/3/0/5/130540477/poxofisafej.pdf
    • http://oceanviewvillagesf.com/uploads/1/3/1/4/131438044/904828773c.pdf
    • http://hellestoproperties.com/uploads/1/3/0/7/130739928/kirumawuvik.pdf
    • http://caninecompanionkollege.com/uploads/1/3/0/7/130775244/rafiwidefudina.pdf
    • http://hawkhillfalconry.com/uploads/1/3/0/6/130639239/38184.pdf
    • http://rbpadilla.com/uploads/1/3/0/7/130739922/segoperevivave-rekovubukene-nakelof.pdf
    • http://seanqiao.com/uploads/1/3/1/3/131383486/kurekasozonasefubo.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_off00007005.bin
3c22ffa1a240f6ecdf2698a05fe02169cd037c9f2ddd64b4de245510fcb4950e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7005 8356 bytes

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