Malicious PDF — malware analysis report

Static analysis result for SHA-256 8781f2474deedc82…

MALICIOUS

PDF

89.2 KB Created: 2021-02-21 23:11:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6bb60b3cbf0ef7c9224e403fcfde3852 SHA-1: 7b7b030ce554513bbd23bfd11a0573a340f7c848 SHA-256: 8781f2474deedc82b33a3f10e05d9a2ae4174dbfe37a9a6e864adfde91a2e641
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable hosting or redirector services, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=aja+ki+pro+go+price In PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/7864939.pdfIn PDF document text
    • http://joy-todays.online/business_letter_template_multiple_pages8zrq2.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/piladap.pdfIn PDF document text
    • http://mimalixigew.iblogger.org/ayyappa_swamy_patalu_audio_song.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/9467362.pdfIn PDF document text
    • https://rujikanonige.weebly.com/uploads/1/3/1/8/131872107/niporetixaxamorul.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/cod_ghost_cd_key_generatorau5cq.pdfIn PDF document text
    • https://bibomezu.weebly.com/uploads/1/3/2/7/132710601/3342515.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/muwol-gudagej-bejifizo.pdfIn PDF document text
    • https://zozisumuwukow.weebly.com/uploads/1/3/1/3/131380825/3603222.pdfIn PDF document text
    • http://pinegrvuig.fun/9970611735686abb.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://vedisupekak.epizy.com/genunamis.pdfIn PDF document text
    • http://kagokonutuvep.epizy.com/xobubukezidimezuzenoja.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/43990013526.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_off0001149b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 4620 bytes
SHA-256: c158388ff2a57bb64df949d8159cb4a8c82ad6ca296f9b236efe740f1bd4f205
font_01_sfnt_off00012464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12464 10420 bytes
SHA-256: 1d806e444a00fefd94dcaaafa5d8dc58f4afc4e6aed6d5850eb479832250d3dc
font_02_sfnt_off0001481f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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