Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1fc804e4f79255…

MALICIOUS

PDF

104.7 KB Created: 2021-04-29 15:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f54c68988adbd9730af5b515a6114d2 SHA-1: a914a9562a7256cf914c6699799fe9769cd51264 SHA-256: eb1fc804e4f792557deba9632502fe94be3982ece5f7e8b9d04b42309e508b5e
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 are numerically or generically named, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=how+to+bypass+the+lid+switch+on+a+kenmore+washer
    • http://rixorevu.getenjoyment.net/89782909298.pdf
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/3b9d548.pdf
    • https://cdn-cms.f-static.net/uploads/4493597/normal_60596ba478dea.pdf
    • http://tuvivukaroj.mygamesonline.org/how_to_stick_vinyl_to_a_cup.pdf
    • http://kapabifidi.sportsontheweb.net/lego_architecture_studio_set_21050_instructions.pdf
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5fd27d3c3972a.pdf
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/2d874e075aac.pdf
    • http://raxawevamavox.getenjoyment.net/vateduvininogekezu.pdf
    • https://xitititoludazo.weebly.com/uploads/1/3/5/9/135987602/kapib-kajosovubibutis-topalojimarota-zadodopini.pdf
    • http://gekigowegijuvo.22web.org/rpg_maker_mv_free_full_version.pdf
    • https://static.s123-cdn-static.com/uploads/4365652/normal_5fe10f70963df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_2ba6bc90dfa341b8a26f2a4c6403b5d7.pdf?index=true
    • https://c24d0846-efa5-4754-a822-a7dc8f88f2d4.filesusr.com/ugd/7b2abd_61ab42f0a6014f18a6c5d19b39c55f04.pdf?index=true
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_5084d3e956774afc8624eaaa67dab107.pdf?index=true
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_8b87990e059b4f0986c2cfeea8b61ad6.pdf?index=true
    • http://babivukir.epizy.com/dbx_286s_used.pdf
    • https://4b98dde3-f65d-4e11-807b-d4501949e87b.filesusr.com/ugd/4a7ebd_1ace99d69024411582de3c78c5a54ce3.pdf?index=true
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_1a0c476665554501bfdde0a9d041db40.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_off0001565d.bin
dffe8b74f684dd44ca972f78bca0f456395ff2364d02554ed1f03e1949a25b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1565D 5672 bytes
font_01_sfnt_off00016982.bin
718075b09413b0dd562e764ca8620c15cdf9046173d58fdff7f6f1a5789f35d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16982 12192 bytes

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