Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe8554d20b0dee6…

MALICIOUS

PDF

82.8 KB Created: 2021-03-29 18:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2104c968581e597a7f9b1efc6ee42370 SHA-1: 31f96cacd0f5c286c286ecf431eb00bca9eda1c7 SHA-256: cbe8554d20b0dee6e8808978d48966886570445c4bfc7141fe46804861113b2d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+inspired+william+shakespeare In PDF document text
    • http://sumapewub.getenjoyment.net/ropiwex.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/gogujomazen.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/all_he_ever_desired_shannon_stacey.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/heie27E/32971536345.pdfIn PDF document text
    • http://optalpha.com/vogepenazobugewasem06zyf.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/color_by_number_math_worksheets.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/ac27973.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/joxarusolupuze.pdfIn PDF document text
    • https://firajapototirop.weebly.com/uploads/1/3/1/4/131452771/zedulokolog.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/jcSYYXK/bubble_level_tool_lowes.pdfIn PDF document text
    • http://stav-games.ru/rovukizezorabimofazufaru8u0i.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/vacation_activities_worksheets.pdfIn PDF document text
    • http://3bureaureport.info/quran_arabic_and_english_translation_and_transliterationro7cb.pdfIn PDF document text
    • https://lixobezabutefa.weebly.com/uploads/1/3/1/4/131406736/ecb23ae0767f.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/ihXBv5T/viboderuruvot.pdfIn PDF document text
    • http://lg-copyrightforms.com/19057237040j6hx0.pdfIn PDF document text
    • https://cdn.sqhk.co/lodabazul/nbI5pXo/fevomesavibagonopovowe.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/82cf4d9d98.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/cgjdLPM/microsoft_sharepoint_2016_online_training.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://redifigikutusoj.myartsonline.com/vifasikufotiruridata.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_846594f2860642c4b3241dd372a50061.pdf?index=trueIn PDF document text
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_90b5787dae1c4b188bd3e89fb937b853.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_e516d5f1ef754fc29c9f8625c78d8efa.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_f61cbafe122d4996930251f39b6a5f25.pdf?index=trueIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_51c480ddd0cb4751afc1a76893852d0e.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 5044 bytes
SHA-256: 1e9a12a8e328b4064303858d210286ece321d40a74485baced81390509909135
font_01_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 11116 bytes
SHA-256: a89fc0b04e5a51dd3d966aa59c1e1d59ca235ab169f06ca9c7e41f23d89221bf
font_02_sfnt_off00012f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F77 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e