Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec13b3b08f5fe7da…

MALICIOUS

PDF

33.3 KB Created: 2020-04-09 04:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3192d028e9deecdbfe6b9bf45b27f1ad SHA-1: e9432f788d07844368d0f23e4c12b2aaded4fcb6 SHA-256: ec13b3b08f5fe7dab385b657e72e5efd7d3f325629439ded39cf10fc7af88228
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. The ML classifier strongly indicated maliciousness. The primary attack pattern appears to be SEO spam or a link farm designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://rabiaosman.net/uploads/1/3/0/2/130272501/130272501.html#how+to+add+honeywell+thermostat+to+app
    • http://kimberlysimpkins.net/uploads/1/3/0/6/130639962/dopobatuta_tetinulepikekan_vusukometeziku.pdf
    • http://michaelcleggsmith.com/uploads/1/3/0/6/130604725/suxogexax.pdf
    • http://abetterchoicepetgrooming.com/uploads/1/3/0/6/130640044/9194042.pdf
    • http://newyorkwinelaw.com/uploads/1/3/0/7/130776485/danidup-lixovo.pdf
    • http://levelupgameconsulting.com/uploads/1/3/0/3/130313391/seporedufumoduzeja.pdf
    • http://money-spinner-uk.com/uploads/1/3/0/6/130621584/pubomigo-jotoje-wuzoromafeles-muwafa.pdf
    • http://aldenscarpetsanddrapes.com/uploads/1/3/0/7/130739779/388657.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_off00005ce4.bin
5a6850b71bc509db03bb1adcaf08d83495e2f821f10202bb6bc8759df164be68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE4 6928 bytes

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