Malicious PDF — malware analysis report

Static analysis result for SHA-256 34da3f95b7825f08…

MALICIOUS

PDF

89.6 KB Created: 2021-03-23 18:24:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 212dd6f085d16d93582ace212ec88d24 SHA-1: 97bbd333c48e1cf8afcfdca635e29971f06fdccc SHA-256: 34da3f95b7825f0850d04a500587850253c75c90b5789c77670e940aea8b94d9
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed to redirect users to external websites, as indicated by multiple PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The primary external URI points to a suspicious domain, suggesting a potential phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly imply an intent to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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://midufefew.ru/wix?keyword=singer+handheld+sewing+machine+manual
    • https://static.s123-cdn-static.com/uploads/4375071/normal_5ff9a9bd7db84.pdf
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/vorara.pdf
    • https://cdn-cms.f-static.net/uploads/4379987/normal_601dd77250923.pdf
    • https://wiwetone.weebly.com/uploads/1/3/4/6/134660192/gudaxup_seloti_xixoxop.pdf
    • https://jibokogemi.weebly.com/uploads/1/3/4/7/134767321/nafeduwaxoduve.pdf
    • http://zujejilolo.scienceontheweb.net/lixafonisogakiza.pdf
    • http://stroymarketmetal.ru/793415132303j3y3.pdf
    • http://instapresent.site/galozominokemiwipibobiplpc18.pdf
    • http://vengriya.space/best_bodyweight_workout_apps_freeez7nv.pdf
    • http://latitekiwa.scienceontheweb.net/53072614550.pdf
    • http://bigowet.xyz/linear_algebra_for_iit_jam_mathematics1k97n.pdf
    • https://cdn-cms.f-static.net/uploads/4488349/normal_602394df32b60.pdf
    • https://cdn-cms.f-static.net/uploads/4377925/normal_601a4d8f0619e.pdf
    • https://sudivepa.weebly.com/uploads/1/3/5/3/135315425/21b77c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_bb10072af82d48f0a2f7c2cefd892c32.pdf?index=true
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_b9b86883164e4fbea46613300c6bc969.pdf?index=true
    • http://nujugeteteda.myartsonline.com/jozipibefavikubi.pdf
    • https://s3.amazonaws.com/loneminovu/what_do_you_do_if_your_kindle_wont_turn_on.pdf
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_ca63dd8d20374ba59589bcfe4daef6c9.pdf?index=true
    • https://s3.amazonaws.com/poguvelefa/driffield_school_ofsted_report.pdf
    • http://lavapokapajemob.myartsonline.com/marathi_aarti_sangrah_file_download.pdf
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_c714fd2e5bba476e91f02c083b751a63.pdf?index=true
    • http://viwudajokufado.atwebpages.com/28576929257.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_off0001207d.bin
005d406e87e841e5a033d3a50006821c30e3f7e8e882212ce20966816b0b89fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 5548 bytes
font_01_sfnt_off0001333f.bin
7b04f2e9ace7d18f8fcb28e8fd3599c722325272486df288b39481cf7d9e6b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 11132 bytes

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