Malicious PDF — malware analysis report

Static analysis result for SHA-256 773b0baf9878823d…

MALICIOUS

PDF

67.1 KB Created: 2020-11-19 06:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: eff0a448c975e0218398967df70171db SHA-1: fa8370fc1fb808d26193aa766cf6899f325c9554 SHA-256: 773b0baf9878823d28c38ce530665a21c88d2a66548578040ad854d90781ef30
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL, 'https://trafficel.ru/123?utm_term=helix+jump+unblocked+games+online', indicates a lure related to online games. No scripts were extracted, but the PDF structure and numerous external links point towards a malicious intent to redirect users to potentially harmful websites.

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://trafficel.ru/123?utm_term=helix+jump+unblocked+games+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5f9eb5d970a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_5f97de4a8bd84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486367/normal_5fac5f8a9c0a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5fa11ea179639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_5fa03edda5692.pdfIn PDF document text
    • https://roxexiku.weebly.com/uploads/1/3/4/4/134445291/dozow_rejak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5f93203d3e81c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_5f97477061447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_5fa76c7b6a055.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/6454704.pdfIn PDF document text
    • https://kanamatadu.weebly.com/uploads/1/3/4/3/134366206/kewatutuwip.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/lunojol/heckler_koch_.40.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/makigozorowe.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/headers_in_excel_sheet.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_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 5608 bytes
SHA-256: 80e45d9af01a0353d342e756defde128a5584ebf9e5dab1fad6fb08d7764f6fd
font_01_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 10068 bytes
SHA-256: ec0c72a722306fabf2423e80429d58e18c8c704876a3e4a074e84fca86d69cc6

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