Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb361d819c56385…

MALICIOUS

PDF

78.8 KB Created: 2021-03-16 10:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fd95982b852b494a0a19d4a42faaba05 SHA-1: 12f35b6eeecdf01b65e1322fe435ef7c655bee59 SHA-256: bbb361d819c563854a836664810ca76eefc9b86154631e050c4937851c310afd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/123?utm_term=rcog+guidelines+for+ectopic+pregnancy PDF link annotation
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/dujapewizeg.pdfIn PDF document text
    • https://cdn.sqhk.co/vozogekom/1ahi1gj/epdm_rubber_gasket_data_sheet.pdfIn PDF document text
    • https://nibafokabatawal.weebly.com/uploads/1/3/0/9/130970001/tawegobowi_xozupojijozup.pdfIn PDF document text
    • https://poxejoretojav.weebly.com/uploads/1/3/4/7/134740271/5656945.pdfIn PDF document text
    • http://trysalon.xyz/70899553767lxkg6.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/jhgOieW/google_slides_templates_for_education.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenodisoda/cjgsJid/18594563027.pdfIn PDF document text
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/1758131.pdfIn PDF document text
    • http://liko-sneakers.com/xijuxilediwukibatadubip2o3qc.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/xokanowewikabum.pdfIn PDF document text
    • http://bavewemelemare.iblogger.org/ruvuvavugit.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/ihShjie/wikipedia_nearby_api.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/jekikexok.pdfIn PDF document text
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/2883140.pdfIn PDF document text
    • https://febufovita.weebly.com/uploads/1/3/4/3/134324671/gikedepebo.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/pojoritetewexop.pdfIn PDF document text
    • http://xuwivezotuw.22web.org/96433583046.pdfIn PDF document text
    • http://artistichomesolutions.com/xoripogapajutun8low.pdfIn PDF document text
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/vasize.pdfIn PDF document text
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/919b5bdf03f36fe.pdfIn PDF document text
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/b3907b869a611c.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/hb0mGia/rojixuniworutibegokali.pdfIn PDF document text
    • https://valutakawewa.weebly.com/uploads/1/3/1/3/131378791/7868078.pdfIn PDF document text
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/xaxamolapasedunob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merekum.rf.gd/discuss_the_agents_of_socialization.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_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 5432 bytes
SHA-256: 9986d84bcd701d821faedfe916f49db78879d423837cdf8af95690f9c3e0ff8b
font_01_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 10804 bytes
SHA-256: 2bffe22ca0c4162635a0b59494e3bf214cb221c5be5fb364d751d5022e28d486