Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff86dcf1a4465ed…

MALICIOUS

PDF

83.9 KB Created: 2021-04-19 09:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 860ff4787c26518a24e6a3b63cabd0ad SHA-1: aa27a4d05a5be8f2caf913a9c8d4411a4c336159 SHA-256: 1ff86dcf1a4465ed94206924deea4f050a5a7f99d0567f0e6a99e7bc13e941ed
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO spam and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://maypoin.ru/strik?utm_term=fl+studio+free+plugins+reddit', are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=fl+studio+free+plugins+reddit PDF link annotation
    • https://cdn.sqhk.co/jilebodetifa/fJPjcjj/igcse_business_studies_definitions.pdfIn PDF document text
    • https://nozubewow.weebly.com/uploads/1/3/1/1/131164313/xogum_nopuke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408993/normal_5fefc8cc5d15d.pdfIn PDF document text
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/efedd6f600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_6060849591827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_603b9b1f8c4ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_602e4052f379c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_5fd6446e6fab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_5fd9cd286ed73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_602f60bd1d141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_5fe9d6bf3ee21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470696/normal_6004537af0a00.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/lujuvoz.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/gfgipij/balls_brick_breaker_2018.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://uploads.strikinglycdn.com/files/f3485b10-28f3-4f08-82a0-1c434652cbb7/jomerekigezuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0cd08ea-99e4-4292-b151-cdde4383850d/metal_gear_survive_glitches_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ec29fc-7dbc-484b-9974-945f9baab0ad/wugurefavema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ef8ffe-d3b5-49f0-9917-98225434c9bf/descriptive_predictive_and_prescriptive_analytics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55fd6310-c0dd-4c99-b4bf-a648772bbfc3/migunolasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f8dd50-8852-435c-a942-c0ec3a4e35a5/senco_nail_gun_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db52eec-fbdb-4316-953d-d3fb14e9cdc8/css_the_missing_manual.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_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 4836 bytes
SHA-256: 169f9c091ec4b68273726077576659f292d986d44792ade06283241ea370532a
font_01_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 11752 bytes
SHA-256: ff050cebc7562c997391507d614b12a4352e94e310079e226e45bb06fe852713
font_02_sfnt_off00013402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13402 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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