Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e7003f2e0130a4…

MALICIOUS

PDF

71.5 KB Created: 2021-04-05 17:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 69e3f185ca22b6c929fd32a6e68f9a39 SHA-1: debb49c655417fbd35d35fc568d936d625683a1a SHA-256: b5e7003f2e0130a40211e5fcd62cde20aa4bc0043ddc708d9d33314a32d7f24f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/123?utm_term=action+replay+software PDF link annotation
    • http://mmmmmme.space/baby_krishna_hd_images_freesq7ms.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://xonuguzuv.weebly.com/uploads/1/3/1/3/131382030/1945332.pdfIn PDF document text
    • http://wubosuvim.22web.org/84895574593.pdfIn PDF document text
    • http://tiktokfrance.fun/is_taco_bell_the_healthiest_fast_food96e1k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_5fe86b79ebe05.pdfIn PDF document text
    • https://zivuxava.weebly.com/uploads/1/3/5/9/135991205/dakexixabilon-xowupok-rubomejazi-seganokuso.pdfIn PDF document text
    • http://xaloripebi.iblogger.org/bofevevu.pdfIn PDF document text
    • http://sweetygirl.club/craftsman_12_gallon_shop_vac_parts35sx0.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/miwunijelomumeg_kikiw_polasa.pdfIn PDF document text
    • http://registrat.space/vosenobapupugv7bqs.pdfIn PDF document text
    • https://gerutabelamulef.weebly.com/uploads/1/3/1/3/131384559/nezovelawijegiliti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_602871472c8a1.pdfIn PDF document text
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/bulaxobo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://04650017-3ca5-4b28-9d9b-11da2816551d.filesusr.com/ugd/aa03de_b8849d90db394d3c970de540e3855558.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/heart_rhythm_strips_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/xuwas.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/zigipifuti.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_3cdd45c109384190b1d958630433417b.pdf?index=trueIn PDF document text
    • http://sijomawawu.epizy.com/afaan_oromo_grammar_book.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/antivirus_para_android_gratis_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/video_show_free_for_windows_10.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_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 5192 bytes
SHA-256: b3cf78977d06235d76f01a5c46711f8848b4f91f5a98325c126ba1a20c119ab1
font_01_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 10500 bytes
SHA-256: d3cfc90b8b0b428e20af302d595d296d4df4af8eb9749985d648dea6167ff914

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