Malicious PDF — malware analysis report

Static analysis result for SHA-256 0991e3623ce888c2…

MALICIOUS

PDF

73.9 KB Created: 2021-03-22 01:12:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3461b6964ff6f33c20090acee13d6f47 SHA-1: 72dadfc12cae3379d8a98a646835aa4bad10bb28 SHA-256: 0991e3623ce888c2059079a5754b8d6e23a866820925031dd3316b148d2ad676
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It functions as a link farm, embedding numerous URLs that redirect to various domains, likely for phishing or malware distribution. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=2006+chevy+equinox+ignition+problem PDF link annotation
    • http://gakukuketisalum.scienceontheweb.net/gadojosotasekunimira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_5ff6c02e15e8e.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/situfigafukun.pdfIn PDF document text
    • https://rugajasaxi.weebly.com/uploads/1/3/4/0/134096424/gogirupurewa-jerinaniw-wapun-natos.pdfIn PDF document text
    • http://xorimomupajo.scienceontheweb.net/english_grammar_worksheets_for_grade_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6020fc4fbafea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495985/normal_60259447e4ab5.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/what_is_the_most_viewed_rock_song_on_youtube.pdfIn PDF document text
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/watawezafu-limuzar-bezemij-gapuboloxoku.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/fitbit_flex_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_5fd31b62f0c0c.pdfIn PDF document text
    • https://rinavufapakoto.weebly.com/uploads/1/3/4/4/134460237/c5bdc6f19913ff4.pdfIn PDF document text
    • http://zuwazekanusur.mypressonline.com/guripivesi.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/6751027.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/fuvorazemusenakozobolize.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/united_states_military_rank_insignia.pdfIn PDF document text
    • http://nodikaduf.onlinewebshop.net/best_behavioural_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/online_translator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/sat_math_test_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/najemum.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/st_lsm6dsl_datasheet.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/hp_detect_motherboard.pdfIn 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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 5788 bytes
SHA-256: 2beecd84b580fe2a5200ce8efa343828dda8e236d64f1827ad12f9f89f9ca4d3
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 11016 bytes
SHA-256: 71622765934f13e40f85cc54cdc88eaf64900d1e7a8148490ca445e45aad7d8e

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