Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd788003d82c9c5d…

MALICIOUS

PDF

79.7 KB Created: 2021-03-31 00:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2a996c72151ddca4843879d2e5bb3d90 SHA-1: c520248eb6b4a71e65828c61bb90159e6a5aa0e3 SHA-256: fd788003d82c9c5d7551e36630601e1371c82f247c033aaa38d893782419ad81
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-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://jacksth.ru/strik?utm_term=are+claire+danes+and+rupert+friend+friends PDF link annotation
    • http://potuduwatolebu.mywebcommunity.org/dowazunorofe.pdfIn PDF document text
    • https://romudakon.weebly.com/uploads/1/3/5/3/135318284/rupafebinitope-ziganuganilik-mamodulakom-vewozavezan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_5fe74b2ab5cb8.pdfIn PDF document text
    • https://dexisuliraj.weebly.com/uploads/1/3/5/3/135346252/bejixova-rolokex-voxepel.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/bibipodirowgd8jc.pdfIn PDF document text
    • https://rovorakule.weebly.com/uploads/1/3/4/7/134774255/6712395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_605d14998bcde.pdfIn PDF document text
    • https://genaxixa.weebly.com/uploads/1/3/1/4/131437685/d1edc.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/textbook_of_biochemistry_for_medical_students_7th_edition_download.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/saluzizefav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5fd622640a86c.pdfIn PDF document text
    • http://topcabinets.xyz/internet_video_er_para_androidu7cna.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/196c3638-d008-4d7e-8df7-a8b69e510911/ingo_swann_secrets_of_power.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_f8c5f21a28a44664b7b7af37212c9e6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c15cf93-3f55-4604-9303-c57d5a6deb8b/71920604366.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/wewerenetibegidupogewobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bedef2f3-11a4-43dd-98a0-10389cc924cd/6684328886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc2195a-7c00-433c-865a-e98ab7d2e1b3/tupewejisolefelota.pdfIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_7923e413a38e43d9a1baaf9a81b22a28.pdf?index=trueIn PDF document text
    • http://vogapodidojuguf.myartsonline.com/system_architecture_diagram_example.pdfIn PDF document text
    • https://39dd5e1d-a581-41ec-a80f-9e19245c660f.filesusr.com/ugd/c2656d_81b544570102421db30eb84c5dada956.pdf?index=trueIn 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_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 5140 bytes
SHA-256: d60c8633352adbfdeffd4c1a3cb82fac60579f368223f060bde685d215dfada0
font_01_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 10932 bytes
SHA-256: c2e36904e7eb7e357f97e2a54f65e20354f1f24f8cbc437b6694440711917b50