Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d35029b6369bd32…

MALICIOUS

PDF

80.3 KB Created: 2021-04-30 22:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d12dbd1b9f188f596ebc827616e55de3 SHA-1: 12f10804699fdc155280fc852b6b5f8704b56c56 SHA-256: 9d35029b6369bd322b4c9caa2b336442d42b32bbc90694e41ee1a342566c1f95
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=tipos+de+derechos+fundamentales+que+existen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5fe73fa45e533.pdfIn PDF document text
    • http://wufusigemaxegok.iblogger.org/wetivagoruzurikono.pdfIn PDF document text
    • https://busuguzokiw.weebly.com/uploads/1/3/1/4/131406797/pafab_vumawuxade_piwuze_dupobavawez.pdfIn PDF document text
    • https://fitetusoxesar.weebly.com/uploads/1/3/1/4/131406062/rafutafu-famosoju-pugipetap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6026e02b27ded.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/nADNido/fatal_fury_special_characters.pdfIn PDF document text
    • https://delidanazej.weebly.com/uploads/1/3/2/6/132681463/xidukatirataz.pdfIn PDF document text
    • https://suzuxagutif.weebly.com/uploads/1/3/4/3/134352905/xafivusuru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412896/normal_5ff764b193dd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_6062050b15151.pdfIn PDF document text
    • https://nododekevage.weebly.com/uploads/1/3/4/7/134733794/jedegukal_gamufobas_tiziwi.pdfIn PDF document text
    • https://marejeloxivel.weebly.com/uploads/1/3/4/7/134709382/4977780.pdfIn PDF document text
    • https://dexuzese.weebly.com/uploads/1/3/0/8/130813054/7799150.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/rafusipomovuli.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/Oijficl/dunkaroos_711_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vodobugatusexa.epizy.com/sars_turnover_tax_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2f44ea-b5bf-49d0-aa34-a753a36b93e3/bradesco_seguros_automovel_telefone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce696b36-4383-4b4a-86ac-bc1e44dfced7/how_old_was_kenneth_hagin_when_he_died.pdfIn PDF document text
    • http://rowomasogig.epizy.com/ximogaradowiwewinasejok.pdfIn PDF document text
    • http://popawevulu.epizy.com/95926032566.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 5540 bytes
SHA-256: 77c87a2b6b8a9361199c1b588c3f50682c4717eda5f2342a56c5cee619b11892
font_01_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 1584 bytes
SHA-256: fe1d26ee472b85148038919860f043a3bb7110c235331520ff44afd5ec8941ac
font_02_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 11820 bytes
SHA-256: 4f0c581ceeb719693f26ec92a4d0f3869df7cf80a4f3ef9f847356bd093f5dfb