Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecb242fa54b536d…

MALICIOUS

PDF

79.3 KB Created: 2021-02-08 09:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ddc93d58dc5e177849b42bee12a33774 SHA-1: d9a4c6dabe24ab5fad5902837b62b0c42c794396 SHA-256: cecb242fa54b536d5639b9da0bc182bb7001c3880a546e027a34035e0cb69140
244 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=calorie+count+chart+pdf In PDF document text
    • https://cdn.sqhk.co/badaxiloru/ibhhHij/game_of_warriors_hack_version_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_5fd27a7068193.pdfIn PDF document text
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/pikumelop.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/ridofijulex_selulefo.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/1733041.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/jhUDgjN/20643958768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_600e59a6dd285.pdfIn PDF document text
    • https://kasutuwisuruja.weebly.com/uploads/1/3/1/8/131872017/wadokinebirax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462351/normal_5fffff03e7867.pdfIn PDF document text
    • https://nazalufu.weebly.com/uploads/1/3/1/4/131409274/wifufimavadedali.pdfIn PDF document text
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/lazugezumuxobunow.pdfIn PDF document text
    • https://lavozeto.weebly.com/uploads/1/3/0/7/130775819/2548772.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/gdjgl85/swing_low_sweet_chariot_biblical_meaning.pdfIn PDF document text
    • https://rurezakofone.weebly.com/uploads/1/3/1/1/131163981/1338024.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/1880742.pdfIn PDF document text
    • https://vuzodafolo.weebly.com/uploads/1/3/4/7/134732359/9bf8a238f73.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/dfxjGKd/twitter_search_by_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_601908d05d35d.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://vunolipatebaw.rf.gd/baxefinofumum.pdfIn PDF document text
    • http://wijopimitiraze.epizy.com/19313612484.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 4968 bytes
SHA-256: 359217b27ef7b692a4f4559ede0923b6b56877ad394c8adee3a62da47ba41b20
font_01_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 10228 bytes
SHA-256: 3d8f0712841f1d59bc6f7a192b19bff8f89b21a611d6a0cdbf3fb0e66940ae47
font_02_sfnt_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2