Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83d02ad76ec9058…

MALICIOUS

PDF

80.6 KB Created: 2021-04-25 22:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 63320a6665d8fa69a1b76684951f85f8 SHA-1: 5562b18cc6c7f950946676ddebfeb6e3ee81e1e2 SHA-256: b83d02ad76ec90588b6bb7987ed0c89b9478327122639e1589cb5dbdf7a6dcc4
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 0.9992

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/strik?utm_term=rca+tablet+tech+support PDF link annotation
    • https://rolewexuvuviwu.weebly.com/uploads/1/3/4/7/134742390/9796355.pdfIn PDF document text
    • http://obzorov.site/22820717525camc4.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/Mgg4gd2/gosizelezuliloxudobasoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411220/normal_5fe912f382291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374366/normal_5fcf31e3c190d.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/5166095.pdfIn PDF document text
    • http://easylearning.space/bbc_tv_guide_uk_sundaydeltq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5fd6cbf25a139.pdfIn PDF document text
    • https://witatike.weebly.com/uploads/1/3/2/3/132302928/4fb06d93d0d7a.pdfIn PDF document text
    • http://meetplafond.xyz/gitajuzubebixusefgo6yx.pdfIn PDF document text
    • http://fumigatoff.online/emma_zunz_es_un_cuento_policialbsqzy.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/dwcjdqK/30274465497.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/37de2b02e5c5c91.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/igjd4ie/huntercraft_mod_apk_1._0._5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_072ce5b7be5642edb1f4a817c9bc655d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/best_books_like_sarah_dessen.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_b385ac1b0db54af8997ff92afe315f2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/bunidesobarepotawegiw.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/9019076140.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_5a0321ce3c4b41039e0cd5fc5545e2e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopeteb/37309200034.pdfIn PDF document text
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_df1b821f5fd24d2994d38c227a0d5f11.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_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 5168 bytes
SHA-256: c07cb1059151b63559692aff0abd77567b5d2b837be73f818d8e5cef41299100
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 11040 bytes
SHA-256: fc4ad5601569882daa4c32022f98ee51d41a0278c56926772a63ccbc41173623

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