Malicious PDF — malware analysis report

Static analysis result for SHA-256 f583c291a226817a…

MALICIOUS

PDF

80.9 KB Created: 2021-04-28 14:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 565da18902db9847d0d0864990f6f875 SHA-1: c410118a776e721f575342bd5394b7bed7547097 SHA-256: f583c291a226817ac435c83c5b283387ada8403511a9f64f84dbd4d99c294127
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with a lure related to 'Baldur's Gate 3'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=baldur%2527s+gate+3+future+races+and+classes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426819/normal_6006f9d687f47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_602a84221bd26.pdfIn PDF document text
    • https://xutifapob.weebly.com/uploads/1/3/2/7/132712150/0f29a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_600fdf13ab1b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_602ec60957597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_603651c5bd39f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_60582293f18cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_60563a8d2d299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_6029c765db46b.pdfIn PDF document text
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/ca5f6ae3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5fd88139a5d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_60379dbc75b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_600d7c32901ec.pdfIn PDF document text
    • https://tudevapibor.weebly.com/uploads/1/3/4/8/134884273/1232911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_604fea6083a26.pdfIn PDF document text
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/japivejuke.pdfIn PDF document text
    • https://jitifawe.weebly.com/uploads/1/3/5/3/135327084/zuxetorez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_601d22c0499f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_602259767ead1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/088789e0-ddd8-4749-8ee7-5ae58095fa24/97192787437.pdfIn PDF document text
    • http://baritobaseben.epizy.com/22043857745.pdfIn PDF document text
    • http://bapaxofobawob.rf.gd/laselik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a90601-1e6e-464c-9df2-aba28b50f864/how_to_make_money_in_stocks_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef19f95-a700-4a6c-b37f-de2649eafda6/bixifesikisexame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e508562e-504f-4688-b80e-c2126d5bd8e5/talobedu.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_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 5436 bytes
SHA-256: 590a97e3685ebf13a81ccd75e715aa117ad956553b62cd101dc285be743bf209
font_01_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 10708 bytes
SHA-256: a8fe2e3e5b9825b01b34c751290bbd1edcbe2ebd46f41290d3748dcf15caa428