Malicious PDF — malware analysis report

Static analysis result for SHA-256 e816c9d8c53567f8…

MALICIOUS

PDF

84.6 KB Created: 2021-03-08 18:19:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6722344bd4490ef3f12f9afabaec0e42 SHA-1: 5b4392d2cff201cd8fcb45954aa2172d58b8d3da SHA-256: e816c9d8c53567f843ce9cbac4f7f40787985e2faf1852138eac463af118e0dc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://resalured.ru/123?utm_term=redox+titration+calculation+questions+answers
    • https://cdn-cms.f-static.net/uploads/4380210/normal_6015dd10dfbf0.pdf
    • https://static.s123-cdn-static.com/uploads/4427785/normal_5fcb02556ca70.pdf
    • https://cdn-cms.f-static.net/uploads/4490529/normal_601f0412dbf2a.pdf
    • https://cdn-cms.f-static.net/uploads/4410975/normal_60163600ad7eb.pdf
    • https://vigenuwotefi.weebly.com/uploads/1/3/4/0/134012497/e3c136e1.pdf
    • https://lezogifivejuz.weebly.com/uploads/1/3/2/6/132682585/8619876.pdf
    • https://static.s123-cdn-static.com/uploads/4403266/normal_5ffc39d548fa8.pdf
    • https://cdn.sqhk.co/dujejigin/jiEY7kv/40740429510.pdf
    • http://zonerokemub.getenjoyment.net/how_to_cut_triangles_for_a_quilt.pdf
    • https://nuzalegexokoz.weebly.com/uploads/1/3/0/8/130814177/5703841.pdf
    • https://cdn.sqhk.co/fafojipedul/0gjuQjj/36166720567.pdf
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/vafaluxuz.pdf
    • http://fomijegi.mypressonline.com/xexumijegugemetokuxodifa.pdf
    • https://tuwuribo.weebly.com/uploads/1/3/6/0/136027226/6e76d043ee37d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_0e38fce6d280468d92ab7e6e2c579f2a.pdf?index=true
    • http://jotudokizer.onlinewebshop.net/belexew.pdf
    • http://jemukiguwuw.myartsonline.com/loziramexew.pdf
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_32da2121fee54dcc9db77e2e0401b83e.pdf?index=true
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_83f54f3cf9324ce4bd9ad3e5756d74d3.pdf?index=true
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_827637d745704ba498ceffadc0e3a4c2.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108a9.bin
ff05a3a1ebe5b8cdc8924b17fb056109ff85d8aa92e95410e2206efae6422e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 5224 bytes
font_01_sfnt_off00011a96.bin
0a3a10b9707b0f3686f502574259d68d929db22255bdf554e23a6ff4f3cb8f59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 12516 bytes

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