Malicious PDF — malware analysis report

Static analysis result for SHA-256 995c693ba3921b06…

MALICIOUS

PDF

82.9 KB Created: 2021-05-09 19:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29614cbf8143af46da46e215880968ab SHA-1: 26e2b4774c0d14b995fe4aa2e4f2208b75773934 SHA-256: 995c693ba3921b06d313004cbe0db25a77bff462c1360ae464333d554d9537c2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a primary one pointing to 'https://xajibur.ru/strik?utm_term=the+ego+and+the+id+freud+summary', suggesting a phishing lure. The document body is heavily obfuscated, but the presence of embedded URLs and the overall heuristic firings indicate an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/strik?utm_term=the+ego+and+the+id+freud+summary
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5fd6644389c72.pdf
    • https://cdn-cms.f-static.net/uploads/4449618/normal_6043f008e8d62.pdf
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/gikokofiz.pdf
    • http://zesegalos.scienceontheweb.net/steiner_waldorf_curriculum.pdf
    • http://tells.fun/how_to_use_the_nato_phonetic_alphabetm1ev7.pdf
    • http://dilawiputonu.mypressonline.com/patedibopeboguxutox.pdf
    • http://lipexifinidoda.scienceontheweb.net/18748112684.pdf
    • http://a-trvl.ru/92239046890ppx6a.pdf
    • https://cdn-cms.f-static.net/uploads/4366367/normal_6058428322842.pdf
    • https://fetuxugov.weebly.com/uploads/1/3/4/6/134655394/3eacbc26bd.pdf
    • https://cdn-cms.f-static.net/uploads/4443801/normal_600a1f2135758.pdf
    • http://rusakova.space/pdf_rotate_foxit3eky8.pdf
    • https://static.s123-cdn-static.com/uploads/4410443/normal_5ff708c6ea875.pdf
    • https://static.s123-cdn-static.com/uploads/4409609/normal_60092d3e3d2c8.pdf
    • https://static.s123-cdn-static.com/uploads/4374840/normal_5fc8ee066949a.pdf
    • https://static.s123-cdn-static.com/uploads/4500450/normal_5fc8b3a561ce8.pdf
    • http://lenudes.com/329126736906p7uv.pdf
    • http://magic-world.site/kagiriselawizojivejye47g.pdf
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/8342546.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/68356a7a-d6d5-455f-9991-c791c0bf284d/the_worry_cure_review.pdf
    • https://uploads.strikinglycdn.com/files/18fa7897-c45c-41a3-a7bd-89194e4010a3/26037763437.pdf
    • https://uploads.strikinglycdn.com/files/c8cd1163-a0cf-4ace-8f61-a115b5201a22/dabuwikadopiduwitaf.pdf
    • https://uploads.strikinglycdn.com/files/695fa877-bb0d-462f-bdd2-78c462d378e9/voniresopos.pdf
    • http://jonesojawu.myartsonline.com/77923119164.pdf
    • https://uploads.strikinglycdn.com/files/21f2364b-efdb-4873-a9e7-a185918d01e7/13620662398.pdf
    • 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_off0001048b.bin
b1bde643e5a4874a536d018811bf981e5403fbef5d8b63d3b4532a958b3b5bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 5340 bytes
font_01_sfnt_off00011698.bin
a23f900537dfb3c43a4e1f45315c535abad987a4a7f581f29bd5fd78f4c06e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 11284 bytes

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