Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f1126acadbf72d…

MALICIOUS

PDF

70.6 KB Created: 2021-01-27 05:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8d0bc9fb35cfcaf27e7453e455c02bcd SHA-1: 1ecb931919dbbd84d837b93e99d27f1cb1887176 SHA-256: 20f1126acadbf72d12994dcea41ad88a017c688e634349e112ec4ed8a563e8c2
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM support this assessment.

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
  • 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://traffnew.ru/wb?keyword=zig%20zag%20friendship%20bracelet%204%20colors PDF link annotation
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/jevujasiwiw-jegamuk-gatigiwewizilej-devikuxuwuvip.pdfIn PDF document text
    • https://nikigetevakawu.weebly.com/uploads/1/3/1/4/131413362/rubisog-buripedojozam.pdfIn PDF document text
    • https://lagipadule.weebly.com/uploads/1/3/5/3/135301279/zasikiduguvi_detarewibig.pdfIn PDF document text
    • https://cdn.sqhk.co/juvokapo/8hhfbjb/98972177198.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/5789209.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/AjeGTec/vupex.pdfIn PDF document text
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/wuzosopidan-puwipubuzekuku-wajolume-dawebevojubob.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/3c15604ca773341.pdfIn PDF document text
    • https://pebarefilegiz.weebly.com/uploads/1/3/5/3/135325086/1420395.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/eM4gcge/14845598924.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/0899a.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/jXe8Aia/national_food_buffer_stock_company_ceo.pdfIn PDF document text
    • https://doxavigefixo.weebly.com/uploads/1/3/5/3/135391607/db62978.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/tosanolaxix.pdfIn PDF document text
    • https://xesufomoma.weebly.com/uploads/1/3/1/0/131070197/1e48bbf757bf.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/egcPYih/22161229982.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuputid/NhjZHsI/wixiwur.pdfIn PDF document text
    • https://nesupopokajore.weebly.com/uploads/1/3/5/3/135394324/wanobipagimodimalu.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/duliwejono-jolinat-jivonusep.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/Dgi9hah/79690890674.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazixipame/macos_catalina_beta_not_available.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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 5652 bytes
SHA-256: 091988aa2fa2d76ddf1192cdbb03864ad9c4ba7ac05ea17989cb663c67f8fbbd
font_01_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 10016 bytes
SHA-256: 305e260c1f5935c27bd71b8466682ea1f9285e53d9ddcb0eef8b59d3630774a4

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