Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab7cd8c25b02444…

MALICIOUS

PDF

68.2 KB Created: 2020-11-10 09:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cc8b9f03dc141cb2ad8074b563bc5e2f SHA-1: ddec8c537e9b2f4fba12dcdb3ebd51336b651900 SHA-256: 4ab7cd8c25b02444f9a70ba11d441127721df6eb49af3d927422564214737a70
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 0.9998

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://traffking.ru/123?keyword=lisiado+de+pies PDF link annotation
    • https://jenogadagebaz.weebly.com/uploads/1/3/4/5/134586404/rinaf.pdfIn PDF document text
    • https://nedonesirewas.weebly.com/uploads/1/3/4/4/134482228/fofukuwimu-dexir-salazomuj.pdfIn PDF document text
    • https://gutilutaxare.weebly.com/uploads/1/3/4/3/134333879/9592342.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/wefabetesiwa-vexipovaxoki.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/836d60c96.pdfIn PDF document text
    • https://durapafived.weebly.com/uploads/1/3/1/4/131438767/sebanamakige.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/7710133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f8f6fd051010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5fa6d35de19a4.pdfIn PDF document text
    • https://satijezusadevu.weebly.com/uploads/1/3/4/3/134310115/9097676.pdfIn PDF document text
    • https://kafigibedup.weebly.com/uploads/1/3/4/4/134479504/0eb444bd288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/kafekifepoxuvukadapiketen.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/english_to_gujarati_dictionary_file_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/tenilolapo.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_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 4768 bytes
SHA-256: b3b9bf4d15d0b409324c472ede027814fd3a7cb271b5c21207424c5ef2ea8142
font_01_sfnt_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 12036 bytes
SHA-256: 735302c214d52917606992189af52855fe0b0357fc7c841ac9b23fb8e75f09de