Malicious PDF — malware analysis report

Static analysis result for SHA-256 73181c8b7de775fb…

MALICIOUS

PDF

54.4 KB Created: 2020-04-11 01:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4787a04b6c34ea44a2165eea40c80b9f SHA-1: 2d7b602c9805c3837c901831dd05bf07a678f43d SHA-256: 73181c8b7de775fbe34aa2b59dbc905330dedc795f3cace81505f8647523987b
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are dynamically generated and point to suspicious domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, and the embedded URL 'http://74-123-77-70.mgwnet.com/uploads/1/3/1/4/131453146/131453146.html#osrs+attack+guide+p2p' suggests a lure to a potentially malicious page. No scripts were extracted, but the sheer volume of suspicious links points to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://74-123-77-70.mgwnet.com/uploads/1/3/1/4/131453146/131453146.html#osrs+attack+guide+p2p
    • http://countertopspdx.com/uploads/1/3/0/3/130323161/gojusixafezo-wonataxuw-kidadamida-wosimipugale.pdf
    • http://youngretireetravel.com/uploads/1/3/0/6/130621698/penafazu.pdf
    • http://specialapproach.biz/uploads/1/3/0/2/130289177/xajebevum.pdf
    • http://whitelivesalsomatter.org/uploads/1/3/0/7/130775171/4808235.pdf
    • http://natureswaybotanical.com/uploads/1/3/1/3/131382531/e5e13ed9add3.pdf
    • http://greatgardensrockford.org/uploads/1/3/0/3/130313178/zitazelafuj.pdf
    • http://dirtroadwineclub.com/uploads/1/3/0/4/130436141/ee40188e2bf0.pdf
    • http://roscoepoundplc.org/uploads/1/3/0/4/130490808/nunopituzezutezuzep.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_off0000af00.bin
832a5335934144ec9fae8879afc9d7e840563b45ed404a7bd1bf04cc90e138ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF00 8144 bytes

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