Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2799e717a2cbabb…

MALICIOUS

PDF

73.2 KB Created: 2021-03-01 00:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c27f9ceb18ba869abb6e7c16e4ccff44 SHA-1: 10df1247d49470ecfdf9547c8c25639cb9d78cf6 SHA-256: d2799e717a2cbabb0ce0359ca5d2f7e429621f8ff651e4b1a3fae0183bf6ffeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://pelibifir.ru/123?utm_term=free+d%2526d+campaigns+for+beginners PDF link annotation
    • http://kozijadeji.22web.org/scarborough_fair_celia_pavey.pdfIn PDF document text
    • https://gukujevanedin.weebly.com/uploads/1/3/5/3/135344472/3580590.pdfIn PDF document text
    • http://leafester.online/head_first_javascript_programming_a_brain-friendly_guide_freedc7xx.pdfIn PDF document text
    • http://latujor.22web.org/michel_de_montaigne_essays_best_translation.pdfIn PDF document text
    • http://noxitafevinuv.22web.org/latupojipovedibijazamuwa.pdfIn PDF document text
    • http://pokanupat.iblogger.org/71559663558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://koxunum.epizy.com/lamedoriratopabugina.pdfIn PDF document text
    • http://nevurewajarip.epizy.com/ct_dds_fire_safety_and_emergency_guidelines.pdfIn PDF document text
    • http://wekijedi.epizy.com/borderlands_pre_sequel_build_guide.pdfIn PDF document text
    • http://zovitox.epizy.com/gta_sa_android_gamer.pdfIn PDF document text
    • http://nitarerot.epizy.com/35530729427.pdfIn PDF document text
    • http://nemiropeseti.rf.gd/83696325950.pdfIn PDF document text
    • http://ganiwozipowure.epizy.com/zuzijewexakudu.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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 3800 bytes
SHA-256: 9b477fc473710ef31134bc3a6480c3ef473962b50cceb5a659ba790cb7fdfe8a
font_01_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 10528 bytes
SHA-256: 4bedfdd4c7e7b02637db0f035849b7c1e15e89cb224d20b19f336f36b72cb26c
font_02_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3