Malicious PDF — malware analysis report

Static analysis result for SHA-256 729b8a76cd95b61d…

MALICIOUS

PDF

74.1 KB Created: 2021-04-23 00:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 05ad4ec9f064535e958680af5ae24333 SHA-1: 509b3b7b6d86906399555823b4aabbf03477a31f SHA-256: 729b8a76cd95b61d7144312385f1aae123ec06f508f5064be53199eddc264885
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=what+easy+exercises+burn+belly+fat PDF link annotation
    • http://fosikukiwa.iblogger.org/catequesis_para_nios_temas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461511/normal_5ff1dd959d55d.pdfIn PDF document text
    • http://tozaworewinox.mywebcommunity.org/25352105469.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/eicjfic/6381938917.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/hhnWD9n/nigisodumagirososok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_60298503a9afd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476446/normal_5fe159ed8f3d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443624/normal_605bc3b9e3f0e.pdfIn PDF document text
    • http://vowuzemiru.medianewsonline.com/phoneme_chart.pdfIn PDF document text
    • http://medupaj.iblogger.org/tozigokejupibunojuxazolu.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/fQTheTB/tewemekazowixobadutuxu.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/asterix_y_los_pictos_gratis.pdfIn PDF document text
    • http://ziduzuraxiralet.iblogger.org/castoriadis_the_imaginary_institution_of_society.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizutobasuxolom.epizy.com/weputexasod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfd0a2d-24da-4b75-8c74-350882c4d272/modene.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_563bc4e8ec8c4ded8ac4f332ec2ed3e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d718d39e-b12b-4296-8162-5daa66a7c405/hierarchical_inheritance_in_java_with_example_programs.pdfIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_1f7ba1f9b8b2452a9a12a0d118950ca4.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_2adf3b585c224015a3403723c1b25ce2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de9e7d4-9b0d-47b2-81de-0c42dee483e9/43959605974.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_3b9fa902f81e49adbfcd0e3ca9f0df37.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_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 5292 bytes
SHA-256: e0310e73d8e0bcf50f9c8570a46dc58e0f36a506bba521582aac7ad295629aa5
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 10580 bytes
SHA-256: c2f8e11458b5d798e3ab935e62a1aee0a26bf682c819f455490e1515725abdd4

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