Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25b7f25cdd5740f…

MALICIOUS

PDF

87.8 KB Created: 2021-03-22 18:04:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea52e8eac27a17734211b3de0aafbaa7 SHA-1: 88ff498c48c9e2b69061bf774e1b521f3d6ce340 SHA-256: f25b7f25cdd5740fef2dc83f5fd8036f4925025e157a1bb0c5c507a13a7841f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. 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 embedded links suggest an attempt to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://botokaw.ru/strik?utm_term=educational+psychology+examples
    • http://gibelineg.sportsontheweb.net/english_file_beginner_third_edition_teacher_s_book.pdf
    • http://fekedusotuxena.iblogger.org/nice_guidelines_for_cerebral_palsy.pdf
    • https://nawixelufa.weebly.com/uploads/1/3/5/3/135317770/jiseronevim.pdf
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/nubajadusixaxawiwor.pdf
    • https://womovenurobo.weebly.com/uploads/1/3/1/8/131872055/rimoduwiv.pdf
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/49c829d.pdf
    • http://sovuradema.medianewsonline.com/87631451851.pdf
    • http://ligexekena.mywebcommunity.org/buferekidexatiw.pdf
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/bded757946de045.pdf
    • http://pokinusuvato.getenjoyment.net/27482425929.pdf
    • http://jusojixanona.getenjoyment.net/55208427318.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_313e5bc1d1f54a5ebb734817900eb623.pdf?index=true
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_eeb39fbee8e44d4eb85ee765aebf2ca8.pdf?index=true
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_75623b0e22114f2392fa9925ff51ef7f.pdf?index=true
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_431678529b21473c97b484f0ca9fcd30.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_ca9b806f14a14311908ed77c7b683e4b.pdf?index=true
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_63c67aef77ba4b0e94b1bc4b23d11fcc.pdf?index=true
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_bddd9696b5cf44a0889e081ef2fb9f2d.pdf?index=true
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_7cb6d513fecc4b8cb729d0974ecba8cf.pdf?index=true
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_2d0ba086027840fc87eeaccf7f3e791a.pdf?index=true
    • http://rebokomixuxoj.epizy.com/windows_10_iso_file_free.pdf
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_3d0a0960a8d64d18b48de13f37dd05f7.pdf?index=true
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_be8393409da34611abd0e1de8843ea29.pdf?index=true
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_ec8e3cf1437a429bb6b52e02f3cb67b4.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_off00010b6e.bin
88593255fba03e3163b840f48be2e203cdd3cbaeb26931b104b9f9045d4932e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 5400 bytes
font_01_sfnt_off00011dab.bin
3dad5f9c2aef9319beb41eb91777c2cc5884efc503820133209698b474d29cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 10952 bytes
font_02_sfnt_off000142ed.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142ED 4324 bytes

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