Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb4bcf1d0dd5084…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 12:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db77e560eaebbb01468b5c46aee80ca6 SHA-1: 52e26a69cac474e537e57b64b6cf28a48b6328e3 SHA-256: 7fb4bcf1d0dd508400c4f7f2e2d81ce5a3aa3d6f76a3d2a0bf0bc78b70457973
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a significant number of external links, with a critical heuristic identifying it as a PDF SEO link farm. The primary URL found, https://mezovuduw.ru/wix?keyword=just+build+lol+unblocked+mobile, and another linked PDF, http://xteenware.online/dejetoup96n.pdf, are indicative of a campaign to drive traffic to potentially malicious sites.

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://mezovuduw.ru/wix?keyword=just+build+lol+unblocked+mobile
    • http://xteenware.online/dejetoup96n.pdf
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fe880eba46a7.pdf
    • https://cdn.sqhk.co/zatejurix/gia2Mep/moto_traffic_racer_1._0._5_mod_apk.pdf
    • https://cdn.sqhk.co/faxinomitux/inVFheo/inspirational_stories_of_hope.pdf
    • http://mixit.info/zidibeje2i832.pdf
    • http://ludshop.xyz/how_to_reduce_temperature_in_voltas_ac_without_remote7i2tb.pdf
    • https://static.s123-cdn-static.com/uploads/4492281/normal_5ffc28723f1b2.pdf
    • http://nowtorrentz.com/amphotericin_b_administration_guidelinesgs8e3.pdf
    • https://cdn.sqhk.co/fibafape/lhcSA6H/ziripotef.pdf
    • https://cdn.sqhk.co/sejarepezibo/eTlhgja/weather_nyc_celsius_yesterday.pdf
    • https://cdn.sqhk.co/kitolitik/ie0jjvn/zuzugidadorilesolewij.pdf
    • http://com-signto2.xyz/193674280982qjup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_0997c82857564fd683687efb8ecf5a2a.pdf?index=true
    • https://s3.amazonaws.com/mavixu/57348368629.pdf
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_289a8165b4584d8882b39a2b3ad797c4.pdf?index=true
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_7c539f5aa2e34109a8132dbabc17bac0.pdf?index=true
    • https://s3.amazonaws.com/zebarufuridorur/dancing_at_lughnasa_character_descriptions.pdf
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_44438ec89a77469b996ff6cf4afd2186.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e195.bin
ba8ba1339d794b0ba2e69f9d624f5776d29feb1d4acfad5b4c81b6ce6a7b2b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 4856 bytes
font_01_sfnt_off0000f1fc.bin
8e276622ecc65dcb085009c67cc7cd5f42511ede11b6225650db097d9ff41019		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 11312 bytes
font_02_sfnt_off00011874.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 4324 bytes

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