Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fb0c6f53886eb4…

MALICIOUS

PDF

65.8 KB Created: 2020-12-25 01:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 84a79d36dd35a725345869e4e84c8ccb SHA-1: bddc800fc47beb5884ab1126bfee1768ae5759d2 SHA-256: 18fb0c6f53886eb44849eb4e7627cc4c0bde28df7fab598e827e0b09e671d262
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the critical heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a large number of external PDF links. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially harmful external sites, likely for credential harvesting or further payload delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=annoyance+so+to+speak+crossword+answer In PDF document text
    • https://lefeputabewaro.weebly.com/uploads/1/3/2/6/132695219/7716247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_5fa78b6d769ff.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/rokepitexonori.pdfIn PDF document text
    • https://pibezenasa.weebly.com/uploads/1/3/1/4/131454503/58c933e4f0c4d.pdfIn PDF document text
    • https://juluvolalo.weebly.com/uploads/1/3/4/4/134435755/wonogolana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409258/normal_5fd08e754fc09.pdfIn PDF document text
    • https://gafanotode.weebly.com/uploads/1/3/4/5/134576189/c0c3fd2e41e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_5f994b92b0feb.pdfIn PDF document text
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/5922405.pdfIn PDF document text
    • https://malomunadososep.weebly.com/uploads/1/3/5/3/135351096/motiso.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/bofake/vawokuzifu.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/60660624762.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/aws_certified_solutions_architect_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/bahubali_mp4_songs_pagalworld.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_off0000c63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63C 5280 bytes
SHA-256: 836c99163fbc0d131399f80c64ca244f9189ee6207658e0cb8d00f77a856234f
font_01_sfnt_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 10004 bytes
SHA-256: 78ea2511a29d3942d0ca043da6e7f2c0d765f1f14480d7f3c92a37b17ff4de74

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