Malicious PDF — malware analysis report

Static analysis result for SHA-256 88471b92615ec70b…

MALICIOUS

PDF

128.7 KB Created: 2020-11-24 06:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 185c0d872a4a664a9e5ba36a6a12a69d SHA-1: 44274e71371f41dec293aa98757ac74239881bcd SHA-256: 88471b92615ec70b0ed187a1da58343e7a8feeb1ca1c4df457e109d35544e5c1
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a redirector to known malicious infrastructure. The presence of a large number of external PDF links suggests a link farm, often used to host phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=saltanat+mt2+efsun+botu+kullan%25C4%25B1m%25C4%25B1
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdf
    • https://nixewoxeb.weebly.com/uploads/1/3/4/3/134354190/julavuferuno-gopoxet-woxakoxel-kinekiz.pdf
    • https://cdn-cms.f-static.net/uploads/4402964/normal_5fabf153c219c.pdf
    • https://fosilele.weebly.com/uploads/1/3/4/5/134593504/wubaravefalituv.pdf
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f8efa4610d3e.pdf
    • https://sagupegijugix.weebly.com/uploads/1/3/4/4/134443219/5015890.pdf
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5fa18bc1a0cea.pdf
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/mulalumefix-zajovazam-lakosarivotab.pdf
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/77cda55b22.pdf
    • https://vivenovexo.weebly.com/uploads/1/3/4/6/134695888/99787.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bitajemisajoz/after_school_program_curriculum.pdf
    • https://s3.amazonaws.com/jivuxo/79906216154.pdf
    • https://s3.amazonaws.com/xezujuxoz/a_logo_design.pdf
    • https://s3.amazonaws.com/bepukuba/16490348225.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001be50.bin
033869bfde30984630d07540a45fce8147dede1decbfac18f00b1b2a9251cbca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE50 5288 bytes
font_01_sfnt_off0001d047.bin
3e4217058df43a3bb8668390f3dd3c35ec4ab38a9044c5068e14028630d04005
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D047 11040 bytes