Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed95db3ca9c2bb1…

MALICIOUS

PDF

77.7 KB Created: 2021-04-20 01:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f0fbb5bb7c9993d444979043c289847b SHA-1: 1a9e9e52edb5da8bda8f1c56ab3ff839b4afee5d SHA-256: 6ed95db3ca9c2bb1f3c60f6b38c2d4ec485d4415d661e07770abc2a95829ef31
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 0.9960

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://mezovuduw.ru/strik?utm_term=scotts+lawn+mower+customer+services PDF link annotation
    • https://nedidibizexoba.weebly.com/uploads/1/3/0/9/130969065/2528798.pdfIn PDF document text
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/dusizusewosefelop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451549/normal_602a14edad119.pdfIn PDF document text
    • http://ritual-venki.online/nusexiduwadiliroevek4.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/bifevola.pdfIn PDF document text
    • http://jobesagaponapa.22web.org/kendo_grid_column_html_template.pdfIn PDF document text
    • https://rizebilawi.weebly.com/uploads/1/3/0/8/130814716/suxemozexo.pdfIn PDF document text
    • http://lnstagramsupportlives.com/widazedifivavurezezeruxnket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374362/normal_60223e50ad05a.pdfIn PDF document text
    • http://risiwivozival.iblogger.org/cdc_guideline_central_line.pdfIn PDF document text
    • http://barbanapoli.moscow/wireless_gsm_sms_home_burglar_security_alarm_system_manualpuqji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_600f12c5d6bbf.pdfIn PDF document text
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/1976617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_603578d2c99d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485299/normal_602f1e8a70671.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://divupalol.epizy.com/sejaxukixuzigunujojiv.pdfIn PDF document text
    • http://xatowumo.epizy.com/14681453583.pdfIn PDF document text
    • http://rodiwube.epizy.com/duvopobomo.pdfIn PDF document text
    • http://lixanixuzuki.rf.gd/11202098045.pdfIn PDF document text
    • https://8de17e8c-b43d-4143-985d-773a0aa332b1.filesusr.com/ugd/01f6ad_2ed7a31fe51d4fec939d10891ca326b8.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_0421d7139171438d8478591a6f9d8b3c.pdf?index=trueIn PDF document text
    • http://botiditab.rf.gd/robotica_educativa.pdfIn PDF document text
    • http://reronagut.epizy.com/dofukoxulilegewuzabiga.pdfIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_dc40cb6ec9ad4e129bdbad6c3e6b47da.pdf?index=trueIn PDF document text
    • http://sidigoxe.rf.gd/agroforestry_systems_in_the_tropics.pdfIn PDF document text
    • http://watimesuw.rf.gd/bandaging_techniques.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_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 5200 bytes
SHA-256: 51a486dc9020028f383669612f62bfaf505b38d5c77b8a68a6ea3a9ba59b106e
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 10760 bytes
SHA-256: a769d6fabb4b1b68fc35a0880b6f71f2e5f522da2f6d8108d085d863a5d7d7d7