Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4131944525accb…

MALICIOUS

PDF

69.8 KB Created: 2021-02-21 21:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1e93ae200510253ef74c0c67cc8d80c4 SHA-1: 4b3d8b2844c7bea7d17583e65f7802603e36e154 SHA-256: 5a4131944525accb6318f7492e5ad41efc28c2fc7f19cb3bec0a7a607360ab05
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm or phishing attempt, with one URL directly referencing a keyword search. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

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://druttle.ru/wix?keyword=blosics+2+hacked+unblocked PDF link annotation
    • https://cdn.sqhk.co/dokukavifig/bQZxqTa/4412548177.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/xjasFha/mozejuwamuxeduxakipupalu.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/5087426.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/pevawituxasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403415/normal_602e61121248a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_602dcc402d080.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/tcnWdhb/88158595765.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/gdzhehd/mapekewudizis.pdfIn PDF document text
    • https://cdn.sqhk.co/zefinotobi/c71Fl3v/micro_measurements_m-_bond_200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_602dcdf66461a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_601629764fe7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_6001cd906cd6a.pdfIn PDF document text
    • https://rerararomimin.weebly.com/uploads/1/3/1/3/131383042/d9d3cc.pdfIn PDF document text
    • https://nuresoxak.weebly.com/uploads/1/3/1/3/131380504/kupanum.pdfIn PDF document text
    • https://cdn.sqhk.co/diwamukef/bJbmvjb/brain_games_3d_level_160.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 5316 bytes
SHA-256: 15c8ab12cec702341e6cf01c6853c0bb58b09a8042f9ea97fe3ac6750fa58367
font_01_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 9920 bytes
SHA-256: 640f44bfc3931c9214cab873eb4f25bfcf0f5ee29b18a5b5aa9462ba290e8ef8

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