Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a59a77a323285e…

MALICIOUS

PDF

72.1 KB Created: 2021-04-01 23:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 40f16976269555a93909f752ed1c1612 SHA-1: 56003aef171f219757143983408bfb66ed76a830 SHA-256: b2a59a77a323285e162b8e128e61b04ef3258cb31ba6e6bb034a7138f78a3f8b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains multiple embedded URLs, one of which, 'https://druttle.ru/123?utm_term=fdic+market+share+report+2017', is associated with a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful 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 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://druttle.ru/123?utm_term=fdic+market+share+report+2017 PDF link annotation
    • http://letgtma.bid/xotamevifixukeguwitastvfkd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371013/normal_5fcc97e91bc40.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/aNLvQid/babylist_customer_service_salary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_5fd9945905787.pdfIn PDF document text
    • http://santaparker.store/46329789451ugczd.pdfIn PDF document text
    • http://bred-enligne.com/3667495016197s2v.pdfIn PDF document text
    • http://oyuncuxx.com/oster_3-in-1_convection_oven_air_fryer_and_microwave_instructionsitcgf.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/ifAf8cX/toolbox_for_minecraft_pe_edition_ios_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407795/normal_5ff1d1cf8e07a.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/rodivegixaxajomodewa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a842af3-ac14-48bf-8f63-80a2ec738da1/netisobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c7f857-9bce-4736-8404-f37e4f39e167/adobe_premiere_elements_14_free_download_full_version_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73fb566e-81ea-4309-98ca-1001ad6b226a/vitujedafaze.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_81be2c2903504b1a83d66e69787e5cf8.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_d575620334ec43d1a7e7d11fb16b2c80.pdf?index=trueIn PDF document text
    • http://vubelifijam.atwebpages.com/mozedunalev.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_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 5704 bytes
SHA-256: f4ba372dbfb0f251c154390099c569ffb543de1cca1797370f6dc497123ba4e4
font_01_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 11008 bytes
SHA-256: 3445fdbaf7c5fc18776105505a8adf59e8010ca7a989f5c0a1217b3fd61d6572

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