Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e57d2bc5914b28…

MALICIOUS

PDF

77.8 KB Created: 2021-04-11 05:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5df20612d68c91a10511e7ea4b0fd643 SHA-1: 5d3d8ac379ea1aa159d8baf69d3981d555a5543b SHA-256: 85e57d2bc5914b28ed00c3855e0fd65c414e18776a3fc58d3099d7cc6f14c37a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://ponafet.ru/strik?utm_term=what+to+do+to+become+a+secret+agent PDF link annotation
    • http://puloxev.iblogger.org/49794607539.pdfIn PDF document text
    • http://afracheat4.xyz/859129337367tccz.pdfIn PDF document text
    • http://juwapes.22web.org/anatomy_chart_muscles.pdfIn PDF document text
    • http://static-get.top/833549955423j9a1.pdfIn PDF document text
    • http://spiritstudio.ru/vitotodisexorifawomaw2lxd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390092/normal_5ff14aec1adba.pdfIn PDF document text
    • http://tigimurudel.22web.org/sutoloz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_6048e569631b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vevojadiren.epizy.com/allen__heath_gl2400-24_review.pdfIn PDF document text
    • http://woloripovopakop.rf.gd/automated_guided_vehicle_manufacturing_stocks.pdfIn PDF document text
    • http://gasisuwuk.rf.gd/16342048233.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/64284953256.pdfIn PDF document text
    • http://xugojejusovofeb.rf.gd/reguworujijaw.pdfIn PDF document text
    • http://bowubibegejojop.rf.gd/35152031473.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_776c449a89c548b79ba54449b61b4e1c.pdf?index=trueIn PDF document text
    • http://fodiragotisaka.epizy.com/amelie_waltz_sheet_music.pdfIn PDF document text
    • http://lajirino.rf.gd/zemusekonobodarasizemazi.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_5ac7b6cd9eda4a70bbf1a0fbef1b50f2.pdf?index=trueIn PDF document text
    • http://linuxuxotarife.rf.gd/bastar_university_time_table.pdfIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_1dc54d40011c48ca9301b132b33b8864.pdf?index=trueIn PDF document text
    • http://rakemexovujepez.epizy.com/kantar_omnichannel_report.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_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 5472 bytes
SHA-256: 05294229afa36677caf4eae62dbe5d3494c56da70daa722ad0ff219ee5924b7f
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 10804 bytes
SHA-256: 6274875b97c3d822cdafac7c88758c3b31e0c6be9f2713308b1c1e3d1397d6dc

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