Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bdf99d0d9c3ac4…

MALICIOUS

PDF

84.5 KB Created: 2021-03-18 07:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8d0b82f98606f06d2cd2ae589d36bff3 SHA-1: 257952aab5ac66da21e8099f542b1d802af6a943 SHA-256: 51bdf99d0d9c3ac46178aa1fafae8f8015b11f7320eb4a4f2cb5870815888265
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to 'tokyo ghoul mask designs' and application metadata, likely serving as a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=tokyo+ghoul+mask+designs PDF link annotation
    • https://pozopili.weebly.com/uploads/1/3/4/3/134310053/8606446.pdfIn PDF document text
    • http://lumoxul.iblogger.org/candra_malik.pdfIn PDF document text
    • http://duwefazef.22web.org/vusale.pdfIn PDF document text
    • https://jebilazi.weebly.com/uploads/1/3/1/8/131856389/lonapafasal.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/the_lying_game_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/ixSRjhc/download_game_blade_crafter_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/jggbAJy/pathfinder_grapple_monk_guide.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/zuweli.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/rutisatul.pdfIn PDF document text
    • https://xifuvago.weebly.com/uploads/1/3/0/8/130813557/pidedulom.pdfIn PDF document text
    • https://terimigekebala.weebly.com/uploads/1/3/0/7/130738799/suvipe-fileke-zesejada.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/1d2f09aa0a.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/4948876.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/315814.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/bivefubem.pdfIn PDF document text
    • http://molufipet.sportsontheweb.net/anemia_falciforme_em_pediatria.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketaxesam.epizy.com/29128534958.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/wusus.pdfIn PDF document text
    • http://wiwedekepumepup.epizy.com/cancer_de_cervix_estadios.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_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 5256 bytes
SHA-256: 605a25aecce02f2f3cb5b215babec87f5d09eebf0a006b8c0a52ea87c68d3049
font_01_sfnt_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 11312 bytes
SHA-256: e288cacb60f26f56ff8a3bcd54017be16a9ec5a9d3a2de4c44daa5ec767d2039

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