Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6dd9000117f3fc…

MALICIOUS

PDF

71.2 KB Created: 2021-05-24 02:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 67c605724a32bcfe2204b57ef24bc098 SHA-1: cf83825da048fe1291cbd04a1158827698c77d2b SHA-256: 8b6dd9000117f3fc6e818167144d0610ec4be3f59fa118937c09cbe3a464e927
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 0.9991

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://soxebez.ru/strik?utm_term=types+of+chemical+bonds+carson+dellosa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388271/normal_602a12ca27fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_60500ae379e96.pdfIn PDF document text
    • https://xaniwunedevivat.weebly.com/uploads/1/3/4/4/134470123/rapalus.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/2800318.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5fffb763a92c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_6054805bdbdca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_601f3cc27f389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448986/normal_60450a50c64f0.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/motidelir_wabotetoresut_polapusunuv_wetomaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497356/normal_6036c3bfd5d06.pdfIn PDF document text
    • https://bisitewo.weebly.com/uploads/1/3/4/4/134496646/7618594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_6056c9673ce78.pdfIn PDF document text
    • https://fifofisepag.weebly.com/uploads/1/3/5/9/135985139/jemagodala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_60327fda8397d.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/39be6fad-9e91-4bfb-b564-61a97aa125f9/3149101212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349efaaa-db90-42e9-89c2-a21f77ddb1f4/14576963802.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/25653668339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20362ac1-3adc-40dc-9a1e-75840a8152e2/blender_2.8_modeling_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0374df-ff21-470d-a8db-751551bd94b1/fujebetuperubufaruvuxuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c444167f-0363-43fa-8fad-e60c42285c79/tinusajirivenobulezepag.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/how_to_draw_hands_for_beginners_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36f73c4-a8f2-435c-bb8c-994278c83139/mamoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a9f9bc-e746-4bee-99f9-20b98f52b714/formatos_para_avaluos_comerciales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3048fa3f-2b06-4645-9440-2ac5ac245c56/basumanubo.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/66628730631.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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 5588 bytes
SHA-256: 4153cbccd4b05676285316d1d7da7fd8cd2b384ecbd25e5627f92337f6c00392
font_01_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 10744 bytes
SHA-256: e426b75f7b3498c61bf0da52c3ad8d75a09a4a38b3ec6c1ae228006028ee8a80