Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25d9202e1a4d29b…

MALICIOUS

PDF

79.6 KB Created: 2021-05-21 21:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9428e7b6f8caeb1c6c85f1d39ad374d2 SHA-1: cdffaeeedb2dc573aa3008441b526b40795f2b16 SHA-256: b25d9202e1a4d29b7c2ff3781e99777167661a2564b724c24b5993e2bd9d9971
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to manipulate search engine results. The embedded URL points to a domain associated with phishing, and ClamAV detection confirms its malicious nature. The document body, though heavily obfuscated, suggests a lure related to PC troubleshooting to drive traffic to the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=how+to+fix+speaker+no+sound+in+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403807/normal_60437a0dda644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_602417302fec1.pdfIn PDF document text
    • https://sedusubix.weebly.com/uploads/1/3/5/3/135333985/7330678.pdfIn PDF document text
    • https://ximofutaxa.weebly.com/uploads/1/3/4/6/134626718/fipizuwuz-wofelepofupe-dugizig-pomun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tigewibejageju/2011_rav4_2.5_oil_capacity.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/31843401377.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/xudelinanelikinugazupa.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/anaconda_hollywood_movie_tamil_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3eb40f4-0eda-4968-9ac0-6a1936385194/zogakupakubewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167ba036-40eb-4f2d-a177-c6b3f5c75066/runakugedupagilunoloba.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/piketawemujonumofonibawa.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/36471249288.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/24426551977.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/niputukenawowu.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/69771371718.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/vugulufipitaxomeguro.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/71656635902.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 5184 bytes
SHA-256: c8a6c31902aaa47743bf1d581b18ccc57e4aa6fa2f92db3dfb8ed810c47485e1
font_01_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 10432 bytes
SHA-256: a9d7a9122150931369bad5dec5d26b9f56db3b598a11f2912c0c1d0777a2052d
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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