Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6be535c1c5bdf2…

MALICIOUS

PDF

81.6 KB Created: 2021-06-11 00:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60335eb009760f92450edc2aaa3c61ef SHA-1: dfc77c3d84964e15339ac41f0794ddcb9f26fa35 SHA-256: 8f6be535c1c5bdf2d98b71517b5d3a70d844d8d8a4d416992e2d413b3cbee41e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of 'Fortnite for mac download' in the document body and associated URLs indicates a lure to trick users into visiting malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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://medvor.ru/pbw?utm_term=fortnite+for+mac+download
    • https://static.s123-cdn-static.com/uploads/4403262/normal_6006b6fe1613e.pdf
    • https://cdn-cms.f-static.net/uploads/4385198/normal_6018a77e3a30a.pdf
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/a5b68e1625b8e2.pdf
    • https://latovadavubu.weebly.com/uploads/1/3/4/7/134716683/mikokodegigawavemob.pdf
    • https://dogixosewe.weebly.com/uploads/1/3/4/6/134633635/63bd0e334.pdf
    • https://mamifonor.weebly.com/uploads/1/3/1/1/131163935/3b7aec2c134c.pdf
    • https://cdn-cms.f-static.net/uploads/4482218/normal_60582826ac4e9.pdf
    • https://womutiliwefol.weebly.com/uploads/1/3/5/9/135964171/xilafuvesiko_nujub_totoxalazove_pemoluwetatokir.pdf
    • https://cdn-cms.f-static.net/uploads/4488139/normal_60bc8e486baf1.pdf
    • https://static.s123-cdn-static.com/uploads/4450733/normal_5ff4d214e62a5.pdf
    • https://cdn-cms.f-static.net/uploads/4366305/normal_60365e6534524.pdf
    • https://cdn-cms.f-static.net/uploads/4401716/normal_6018e9bcdd806.pdf
    • https://xupulepil.weebly.com/uploads/1/3/4/3/134322414/287124.pdf
    • https://zidefiwemisuj.weebly.com/uploads/1/3/1/6/131606537/ganimedivuzoven.pdf
    • https://pukapukipek.weebly.com/uploads/1/3/4/6/134636258/1742022.pdf
    • https://cdn-cms.f-static.net/uploads/4418985/normal_605f63857bccb.pdf
    • https://razolonupul.weebly.com/uploads/1/3/4/8/134888498/2551508.pdf
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/2508757.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2cb6cb5d-3e4a-4692-b754-febdd5700551/togofawililopoke.pdf
    • https://uploads.strikinglycdn.com/files/3eaf4a4c-29b9-4de2-92ea-39a89f93c371/internal_audit_training_courses_uk.pdf
    • https://uploads.strikinglycdn.com/files/0cdd777d-f3ce-4257-a440-36f551c97888/fojiwojozipezowenusobowaj.pdf
    • https://uploads.strikinglycdn.com/files/8d3a98a1-58c6-46fd-82a7-07a95ed15ad9/55065601787.pdf
    • https://uploads.strikinglycdn.com/files/9e9804f3-d7cf-4b5d-a945-7e3eee33bc7b/zulex.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_off0000fe88.bin
28e3f1c763e40aa1de8dde435de85cf0be4df21a7a5f45a1bdf0fc9f261e41ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 5036 bytes
font_01_sfnt_off00010fa3.bin
eaf48f22803e5dda16f5538e92031a6db7c52b862226ae05c718c1b352258414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA3 13348 bytes

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