Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f590b6c3cdbb038…

MALICIOUS

PDF

77.4 KB Created: 2021-03-28 11:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13806357f39d8609dc000dcf37214977 SHA-1: e0e7ebd5a1647d5963034772c8a071a7a7e750f3 SHA-256: 3f590b6c3cdbb03831e17a4b8e3e83503ee4f0735fb4bc3546b77420b57d4b46
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 of which point to PDF files hosted on various domains, suggesting a link farm or redirection scheme. The primary embedded URL, https://midufefew.ru/wix?keyword=economics+common+assessment+answers, is likely intended to trick users into clicking it by appearing as a relevant search result. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing and malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://midufefew.ru/wix?keyword=economics+common+assessment+answers
    • https://cdn-cms.f-static.net/uploads/4444853/normal_6045021abb8d6.pdf
    • https://migufakugiguxob.weebly.com/uploads/1/3/4/5/134579218/xoxopuwisajemekir.pdf
    • https://static.s123-cdn-static.com/uploads/4373248/normal_5fccd8b57daa5.pdf
    • https://cdn-cms.f-static.net/uploads/4470552/normal_600f4881290be.pdf
    • http://alcozerox.com/jupefezuxidewarizinewoi475.pdf
    • http://sfr-webmail.com/standard_leave_form_template_south_africaw1ppt.pdf
    • http://remontlegko.info/3_words_to_describe_a_rainforestaipgg.pdf
    • http://brumbum3.xyz/puwomakaxutatiludarbvrw.pdf
    • http://about-igsupport.com/conjunctions_sentences_with_answersr8p8j.pdf
    • https://sowupetu.weebly.com/uploads/1/3/0/7/130739285/ronajugonuv.pdf
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/c14b9bf.pdf
    • http://pink-echo.club/java_spring_resttemplate_thread_safen1drx.pdf
    • http://idealica-italiaofficial.site/who_was_the_first_caliph_of_islamxto8o.pdf
    • http://flipping-car.online/javemixagazerfdqv.pdf
    • https://fawitazekivaji.weebly.com/uploads/1/3/1/4/131454143/binuli-dasegofe.pdf
    • http://nonly.xyz/how_can_i_get_my_driving_permit_during_covid_192w1ec.pdf
    • http://skidki-day.store/what_can_you_give_a_teenager_for_anxietyjpppo.pdf
    • https://womarunere.weebly.com/uploads/1/3/4/3/134315700/361214.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_7c86389b57c748a2aace62260799ab6e.pdf?index=true
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_8a006fd54b224b78925bd805a0ba16ad.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_eb63b5b6bdba437092bb721bcc39da95.pdf?index=true
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_81427f6da61f4b97978b13905ca4cd32.pdf?index=true
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_26275e3a3cf9467aaa2503f1701cfd53.pdf?index=true
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_83d8245119a54bbaa4717cacbfb4e69c.pdf?index=true
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_fd1798388e9d495596fe0b50e1a01270.pdf?index=true
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_cddb8e95a51a483fb81c29df5e457775.pdf?index=true
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_f4703493841b4c2f8e856701aab8bc1d.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_off0000f28a.bin
b9552467e1deb76b108a71fc4d1deec9dc93f28505e3469a633eb7ccdbedca94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 4964 bytes
font_01_sfnt_off0001036a.bin
c6b3c3974f567f26c5f18458304e8147fd14756b166b1bcdee9ab67b6c33d63a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 10748 bytes

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