Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4098e9dd23f6528…

MALICIOUS

PDF

71.1 KB Created: 2021-03-17 11:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2249b7cb7ee6866c717f61526ebec2d0 SHA-1: f2866632d78d8b16858e715970a2a52ab83f0b1a SHA-256: b4098e9dd23f652836a76f2f73fdffb147ad4d09118c5112de7b15da45f090df
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=cessna+aircraft+spare+parts+suppliers PDF link annotation
    • http://medesutaduj.22web.org/how_often_to_change_filter_on_hot_tub.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/xfi_sportsman_instructions.pdfIn PDF document text
    • http://mivegik.mygamesonline.org/difewevorekokojujul.pdfIn PDF document text
    • http://gazizelasama.getenjoyment.net/14824219115.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/kobavunujewesofinafe.pdfIn PDF document text
    • https://kexeluki.weebly.com/uploads/1/3/4/6/134627649/4281088.pdfIn PDF document text
    • https://gimoxawoja.weebly.com/uploads/1/3/1/3/131380550/ruzowi-buxitasowen.pdfIn PDF document text
    • https://pimumurex.weebly.com/uploads/1/3/6/0/136027953/5867134.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/sun_tzu_art_of_war_quotes_leadership.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/new_holland_tc30_service_manual_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c976cf37-4d2e-4195-8b2b-9fea7aeea73e/65203041657.pdfIn PDF document text
    • http://zopefunexot.epizy.com/66844433559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe96742-490f-469a-9ab8-4716b1a9473e/lexoduvutowezokoreduxumux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8437eb5c-0a24-40cb-ba6b-3e38662f5634/84352728330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d799a068-1962-4d8c-a185-11e68c0e3cf1/programa_para_hacer_diagrama_de_clases_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60eddd2-e5b4-4eda-9e22-90629adccaf2/fosofanujaked.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_off0000d892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 4916 bytes
SHA-256: e420b828d1add724bdc1db91e6e46cdebeb564b926419335979197674937b519
font_01_sfnt_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 11168 bytes
SHA-256: 7e5ff65a8f16d953eae4addcdd0a2632a8070e225e408b373e4a9712df02c371

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