Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9c02990f37d4fd…

MALICIOUS

PDF

74.0 KB Created: 2021-06-14 00:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1352713ba0c4622119db6f6480ccf226 SHA-1: 2613734e67903f59e8fe787de57256a6534007f2 SHA-256: 1b9c02990f37d4fda2cd1cddcaca1c6bef73caa53c11e163f4d567f005474c7f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://chcial.ru/pbw?utm_term=beach+buggy+racing+2+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414873/normal_6069fa2bc4b5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_604d0f0eb40ed.pdfIn PDF document text
    • https://zujakeme.weebly.com/uploads/1/3/4/0/134041616/9266144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_604639ec5a8b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_6014b81b89aa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_605578734a525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483836/normal_60363823eb6fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_5ff2b53c47027.pdfIn PDF document text
    • https://daxatuvumuna.weebly.com/uploads/1/3/4/8/134863787/kobekoga_gelenodaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_60512dfb092ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_6035c4a05d95d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4500877/normal_60b0067f44f19.pdfIn PDF document text
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/8780e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4451033/normal_60b3f26e2bd37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386086/normal_5ff0769ac8b10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pugaxigodaka.pbworks.com/f/47063333757.pdfIn PDF document text
    • http://runavepekid.pbworks.com/w/file/fetch/145175949/small_quotes_for_brother_and_sister.pdfIn PDF document text
    • http://mokakiw.pbworks.com/f/titan_quest_anniversary_best_builds.pdfIn PDF document text
    • http://wetavun.pbworks.com/w/file/fetch/145072332/third_conditional_exercises_worksheet.pdfIn PDF document text
    • http://mabigeroxoso.pbworks.com/f/tecnologias_duras_blandas.pdfIn PDF document text
    • http://veposasidot.pbworks.com/w/file/fetch/144720951/fufepixuzopek.pdfIn PDF document text
    • http://ronefete.pbworks.com/f/17335157481.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_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 5736 bytes
SHA-256: a92d8416feec4a62b3a4d25c497000567fcbe8d03b3acceec2d084d31aa73eda
font_01_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 9980 bytes
SHA-256: 619aa7264166dd18c732990f6f977c60a1a62c84287ba0e07e5c530de778273e

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