Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a2935e6cf289ad…

MALICIOUS

PDF

73.9 KB Created: 2021-06-05 17:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e4bc05992d3bc027eb26dc8af6a0c23 SHA-1: 79773afa8415926cb93f78b6cac9270f93191f56 SHA-256: c9a2935e6cf289adf47a2a9e73ff3b2fc9c1a46946aba0eb8cf7865e2597d66f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, pointing to various PDF documents hosted on external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/123?utm_term=arithmetic+geometric+harmonic+sequence+worksheet
    • https://zoxutelipiroga.weebly.com/uploads/1/3/1/8/131871488/7080646.pdf
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/fd4add88.pdf
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/5516806.pdf
    • https://mesenogixu.weebly.com/uploads/1/3/4/7/134736765/ce845b0.pdf
    • https://julupeti.weebly.com/uploads/1/3/4/6/134608278/balojorol-fuzodevan-kesasejaxuw-zotus.pdf
    • https://xexomogaju.weebly.com/uploads/1/3/1/4/131438449/6965343.pdf
    • https://taxubixud.weebly.com/uploads/1/3/4/7/134760406/jelujaduw.pdf
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/ba3ccbcc019.pdf
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/102e7d0e085d69.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vasoxekisede.pbworks.com/f/ronolusewuf.pdf
    • http://mumasenekera.pbworks.com/w/file/fetch/144417771/football_manager_2014_patch_14.3.0.pdf
    • https://uploads.strikinglycdn.com/files/f54f4fb4-ec21-4336-a45d-c9a84976d1dc/52324084696.pdf
    • https://uploads.strikinglycdn.com/files/9a6cfeaf-cc0e-423a-96e6-c8608a9f7f51/lapudum.pdf
    • http://pitavumiza.pbworks.com/w/file/fetch/144624237/we_wish_you_a_merry_christmas_piano_sheet_with_letters.pdf
    • http://jitilabajeko.pbworks.com/w/file/fetch/144665964/asus_pci_simple_communications_controller_windows_7_64_bit.pdf
    • https://uploads.strikinglycdn.com/files/e6193449-a765-4d4e-b754-89cac4f65cad/ge_spectra_oven_issues.pdf
    • https://uploads.strikinglycdn.com/files/4c0a9251-6992-4fac-aa59-f6e9886e5cc6/humanistic_learning_theory_activities.pdf
    • http://mogulazedub.pbworks.com/f/fuxuwifarulita.pdf
    • https://uploads.strikinglycdn.com/files/5de63331-be8d-4f0f-82ba-049c24970feb/4205379091.pdf
    • https://uploads.strikinglycdn.com/files/95ff2680-2aff-4779-ad52-e13d437fcd77/44216396732.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cad0.bin
0d739b5988a4a7e221abdf607fa684f084a1156416d5844d730f91f789a286c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 5452 bytes
font_01_sfnt_off0000dd40.bin
6a124ecee8efe531fb5cd6f758a7cf7a38e92715b5c6e9e4df403257ccd6f9c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 11220 bytes
font_02_sfnt_off00010346.bin
249651805b0a8f5b4743f17da7e3943b18be49f9c75a96c0f18a2f62b87e55bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 16084 bytes

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