Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b2cbce4522fdef…

MALICIOUS

PDF

74.8 KB Created: 2020-12-15 23:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4dd0ffd78bf1a823b907d9db657f29fd SHA-1: 9c10087f3c5d95edfcac72d4733c0d81f40070fd SHA-256: e3b2cbce4522fdef60f29b38c6dc478a050cd6f9c530887af69b38e9440de7fb
156 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 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 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.
  • 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://traffset.ru/strik?utm_term=pantropical+spotted+dolphin+pictures PDF link annotation
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/kenufijofozozuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5fc54e8c846c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f9d55f8caa50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5fc25b35e3eae.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/99898584-ffe2-40cd-b4a8-67020501395b/pals_manual_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e924842-204e-46e9-8249-7e72f7c17677/pixikuzixazid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d480bb53-d04c-45d3-9d6e-50eb0dd3ffc2/52037298020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea45a40-d307-4d66-850b-fc83e13bec69/zubowokupodesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e535c0-9026-4700-8917-5b8a3eea4ac9/max_rank_in_gambit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd3afb9-5704-4cc8-a99d-b0aaf2e4bace/81438823299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49aaf01f-e794-439e-8137-0db948b6b837/60406566766.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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 5164 bytes
SHA-256: 15766e24d22b19038b969a5de0c741eb14ff912fc3360307079cdcf1b93a9bfd
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 11648 bytes
SHA-256: 91ee44b97f7c5170115dfd7eb841e177eceb4f9cd4b3d0183b0a5a4bcdaa568a