Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bff7e3356978b57…

MALICIOUS

PDF

65.3 KB Created: 2020-11-29 11:00:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b587a1a16786bafee1f07293ebf14d06 SHA-1: 96fa2fe70be67f4f1aadec1644dda8970cfbcebe SHA-256: 2bff7e3356978b570936b0bb8e3a48737204709b429096a12b6b2a51f74f240a
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://trafficel.ru/123?utm_term=electric+grain+mill PDF link annotation
    • https://fimetopim.weebly.com/uploads/1/3/4/3/134399480/0cc23c7e694.pdfIn PDF document text
    • https://jamexujibelesuw.weebly.com/uploads/1/3/4/7/134748805/vajoronativax-pubigufag-kafidiloloda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8784e5d10a9.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/jatelu-zukolugaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_5fb8635cb5818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f8d4fe36ab08.pdfIn PDF document text
    • https://toreliga.weebly.com/uploads/1/3/4/3/134335880/kisatajuxof_pokiguf.pdfIn PDF document text
    • https://basisini.weebly.com/uploads/1/3/4/7/134775363/4660708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f8a0abda25ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_5fa2f5a63c744.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/gafedupeba/ncdpi_pacing_guides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a757763-998f-41b0-887f-0487f21eb35a/imponte_dukes_location.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/amrit_vani_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7e89e3-ef0c-4bd6-9cff-1d1c6e822601/21553062280.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_off0000c4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 4900 bytes
SHA-256: 7767a85d721a38263fd85879733cf4b254c78269e72903d23ba2db3d9737bad1
font_01_sfnt_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 10456 bytes
SHA-256: f35a6e62ac3f6b201109da925349f4a59c660731fbb61592c0e6034bccd2c0f0