Malicious PDF — malware analysis report

Static analysis result for SHA-256 43899aaff635c78c…

MALICIOUS

PDF

64.4 KB Created: 2021-02-16 04:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d5079de37daa844095e6e72cee58e677 SHA-1: bcf6cba0fcba9d1d5c9ba7688a88ff3b826641e2 SHA-256: 43899aaff635c78c949ad55cdd0a88bd55af71d1a0bfd7213f4467e05df0a953
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 various domains, suggesting it's used to distribute phishing content or redirect to malware. The presence of multiple external links and the detection as a 'Phishing.Trojan' 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://druttle.ru/strik?utm_term=air+front+computer+interactive+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423431/normal_6027e1c725521.pdfIn PDF document text
    • https://dojosofezi.weebly.com/uploads/1/3/5/3/135390984/4700081.pdfIn PDF document text
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/sobegesivurasij-pofob.pdfIn PDF document text
    • https://pedumukelogo.weebly.com/uploads/1/3/0/9/130969284/sutexobug.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/gxyiizh/retro_world_llc.pdfIn PDF document text
    • https://kofagegupuk.weebly.com/uploads/1/3/2/3/132302723/d4f69f440c9f.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/firudafukopon_padetebivebil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469145/normal_602689a008f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_601c7b0aa4646.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/jekgfmf/negipija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_6027840f621bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_600377d47bae2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444877/normal_5fcce0bb63fbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000be58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE58 5532 bytes
SHA-256: e629d187aad0f92350d159082d5909f19e13d94009451a791c7ff3f447875b9e
font_01_sfnt_off0000d11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11D 10360 bytes
SHA-256: 640017db13b6d7f9bcc5af2b5c445b4f56fe09b069c207f9831639e500a212d1

Open this report in the interactive analyzer, or submit your own file for analysis.