Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a8b950993d3a77…

MALICIOUS

PDF

87.6 KB Created: 2021-04-02 06:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 702880ecbfe8f55cbd5f2bc13d0cbf17 SHA-1: 53c39276ee4b2b20d17f41a39e49a12efe3faa35 SHA-256: e1a8b950993d3a774e4ba285f3bbc852ef9303bc6119f5ad6013a805521a17e7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam and phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious or spammy websites, such as the identified 'botokaw.ru' domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/wix?keyword=best+clash+of+clans+army+th11 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457843/normal_605cd1bb60960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475729/normal_5ff4b32fc2ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490140/normal_60527e6a17716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fd853f57137f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_50f6473ba51a4debb69380b200dfe7df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56607ef4-d455-4eb3-acdf-f94098275f80/how_to_find_number_of_periods_in_compound_interest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e5c88b-5f90-4a4f-b6cd-1bf266ac3393/nekut.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/mojegemivolazule.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/15448760490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147eaa28-8ec8-4d31-af4e-5a3006f6202f/38151355704.pdfIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_bacdf25f12bf4efb87cc6590ded8fa4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujesulad/pokizuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a95df93-a86a-469d-8a84-00f97fb06f00/wizageku.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_5c1cd96c78b3422a9dd0604581918db5.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_bbf5b170fa9d455b9da24727f3081f51.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_1c00208148bb4c0c9ff342980d7db16d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kewakuko/6641365548.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_e187c4fb1d814b8abe62b084aa0ca9e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/2012_dse_econ_paper_1_answer.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_a40817a7103841b088575e36c141ef03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce90a6a-80ce-4021-883a-7eacaa5d6e9e/cyber_security_course.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_24201009e89543af98bf54429df793a9.pdf?index=trueIn PDF document text
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_4b249e9547404cfdb8ee89cf065dc089.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_337f54b5b1a74dc193a3b78f1025ed76.pdf?index=trueIn 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_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 5324 bytes
SHA-256: 975d01a204989986a202a918591b3878d31d0711865f00a99ab5664349befcf4
font_01_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 10736 bytes
SHA-256: 053a8166922d0525c42fbf9125b81d2939aafaf94a59c6d61f1df26532a345b5

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