Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c4fb53c3b3b5d9…

MALICIOUS

PDF

83.9 KB Created: 2021-04-08 00:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b8c56d5b134e6ec9ba1534f5cff58337 SHA-1: 2efde0b8413f3a9b32eef486ac0764b35c636594 SHA-256: c7c4fb53c3b3b5d91b009bc44dda97c451f30287ec9885b8c5aef2b3e17e4995
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The primary URL, 'https://seumenha.ru/strik?utm_term=how+to+reset+voicemail+on+mitel+5312+ip+phone', is presented as a solution to a technical query, likely a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=how+to+reset+voicemail+on+mitel+5312+ip+phone PDF link annotation
    • https://cdn.sqhk.co/bevoroxur/LiggjUq/34247294352.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/jhSF9hj/dog_birthday_cake_recipe_simple.pdfIn PDF document text
    • https://cdn.sqhk.co/kirovuwuvo/iaLih30/fizugomitadapiraveb.pdfIn PDF document text
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/4285db1e636a13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_605e15f9b4de7.pdfIn PDF document text
    • http://nuvuzujujafusu.22web.org/adding_mixed_numbers_worksheet.pdfIn PDF document text
    • https://vefavufarexuba.weebly.com/uploads/1/3/4/3/134315694/tixerepope.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/IOhijjN/momodudilomezek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450732/normal_5fda860dc5037.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/iqgjjjJ/53713128724.pdfIn PDF document text
    • https://vizazoxo.weebly.com/uploads/1/3/4/6/134600102/fagipupopif-nisefux-kinezulinenugi.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/b2jdJWg/mololovapepagebebidaf.pdfIn PDF document text
    • https://vulelarebu.weebly.com/uploads/1/3/4/9/134900748/nuduzagibi_piruke_gewotak.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/eGWGXve/best_auto_racing_camera.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/eLig3qQ/47044504625.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/jd6ib9Y/pomarumomew.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/jvIWok2/2017_f150_super_snake_for_sale.pdfIn PDF document text
    • https://vepoxiwoja.weebly.com/uploads/1/3/1/1/131164136/nimekaxifaf_tukob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482018/normal_60048fd4f0774.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_5341881f741344d9a199f5834aad6bdb.pdf?index=trueIn PDF document text
    • http://mowoled.epizy.com/capitulacin_de_santa_fe.pdfIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_b26b9796a00a4456adbc130c89941f99.pdf?index=trueIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_23638d41d23142d29d1f8f11b55bafbc.pdf?index=trueIn PDF document text
    • http://vovexibixi.rf.gd/song_of_solomon_quotes_about_singing.pdfIn PDF document text
    • http://bibarixe.epizy.com/mathematical_thinking_journal.pdfIn PDF document text
    • http://bimekikup.epizy.com/bertholdt_transformation_ost.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_ed2a788740e8412ca6ed8363277caaa9.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_5fb57e6cd6ef4d32b7813aad48e757ac.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 5760 bytes
SHA-256: 252940c11be61ab6a9b088d7dd7fb84b948c663e99d11e5bef00f6a424528b2c
font_01_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 11516 bytes
SHA-256: 336d78b41504345fa6ca1c1341605ce64133c975e06da32e4cf4481741634fe8