Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f14c18f70bc30e…

MALICIOUS

PDF

66.6 KB Created: 2021-03-23 13:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0430819e0c12567aa3e7590f1895e248 SHA-1: d8fb19bd9082b96968793e3eeeb2af6fd974f696 SHA-256: d6f14c18f70bc30e9de623d1556d6f92d08b5738469596b704c861a3b3c4980a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to other PDF files hosted on various domains. The primary purpose appears to be SEO manipulation or distributing further malicious content through these links. The presence of many external links and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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
  • 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://kuzutuzo.ru/123?utm_term=new+oral+anticoagulant+reversal+guidelines PDF link annotation
    • https://semowonobepak.weebly.com/uploads/1/3/4/2/134235862/xirabovetuzogidabe.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/vikifovorexodaf.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/8782641.pdfIn PDF document text
    • https://wabatopopelak.weebly.com/uploads/1/3/0/7/130775953/92907.pdfIn PDF document text
    • https://pabekebu.weebly.com/uploads/1/3/5/9/135990513/8ddc3188220c.pdfIn PDF document text
    • http://lelofewadu.iblogger.org/castle_of_otranto_character_analysis.pdfIn PDF document text
    • https://fifitedogij.weebly.com/uploads/1/3/4/7/134747960/5640075.pdfIn PDF document text
    • http://xakugitanaz.iblogger.org/how_to_read_guitar_sheet_music_notation.pdfIn PDF document text
    • https://nozabuzewetuk.weebly.com/uploads/1/3/2/6/132683147/sudavitekiv.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/waforebal.pdfIn PDF document text
    • https://bofazereb.weebly.com/uploads/1/3/4/6/134675062/f85929.pdfIn PDF document text
    • https://xesinuvukuwufo.weebly.com/uploads/1/3/0/7/130776104/befilezaxumom.pdfIn PDF document text
    • https://jifafaxima.weebly.com/uploads/1/3/1/8/131871415/kukaretuvojono_timatoxulove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dotosetebokiru.rf.gd/sword_art_online_episodes_order.pdfIn PDF document text
    • http://sugorotebego.epizy.com/81332183135.pdfIn PDF document text
    • http://buxuzob.epizy.com/22333366117.pdfIn PDF document text
    • http://vofazos.epizy.com/how_do_i_fix_error_code_51330_on_my_wii.pdfIn PDF document text
    • http://fedasumenusum.rf.gd/kesitabowif.pdfIn PDF document text
    • http://tedakixerek.rf.gd/97149612051.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_off0000c627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC627 5228 bytes
SHA-256: db5771353c3bf475b98b742a567c4255b58ad2c023d729c2cadc6a1fdf8dcbe2
font_01_sfnt_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 10288 bytes
SHA-256: 20b289dd61c8b145746fabdf6541b71f596c1997c779effdd973b4114743b2b8

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