Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6b477ea961ba90…

MALICIOUS

PDF

78.6 KB Created: 2021-03-17 03:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f1d57852d6acbb4a87238f844dbbc63b SHA-1: 17079652dca96deb8a119af9e26c16347f59fa1e SHA-256: 3f6b477ea961ba90a5ceecfe913330fd4e7131636636e183fa638ecf92644e32
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 0.9993

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://zajinet.ru/wix?keyword=medieval+times+transportation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407781/normal_5fe18afec3549.pdfIn PDF document text
    • http://sutobep.getenjoyment.net/wopitisasodexa.pdfIn PDF document text
    • https://rirenumu.weebly.com/uploads/1/3/4/8/134884077/fabadagojaperoj.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/jhQ6xhD/mirat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_60092faa5286b.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/how_to_read_english_newspaper_download.pdfIn PDF document text
    • https://murasujudadalox.weebly.com/uploads/1/3/5/3/135338307/towusogig.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/hakjfgd/racing_3d_game_free_download_for_pc.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/medical_embryology_practice_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/temududote/ghi6cUY/arcade_daze_xp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382974/normal_5fff30baa5308.pdfIn PDF document text
    • https://xikuvisaduwobax.weebly.com/uploads/1/3/5/9/135962120/6451331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_5fea05e971ddf.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/Qlejfjh/jujejivuwir.pdfIn PDF document text
    • https://safipeta.weebly.com/uploads/1/3/1/4/131408280/wokibobus.pdfIn PDF document text
    • https://cdn.sqhk.co/kuviwifeja/0N61id2/captain_america_civil_war_wallpaper_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/can_you_name_your_child_god_in_america.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6782fc7-be2a-4a2f-8df8-6cf9405abab3/jagovisavevifelukut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7bd6df-1c46-4310-ad4e-e54c2ae44727/bissell_power_steamer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c561a4bc-34cc-4df8-aa33-585ad5cbc10c/crochet_patterns_hats_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3e7aca-6f7e-4be7-92db-1e9343dac986/home_theater_blu-ray_samsung_ht-j4500_3d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b60274-87d0-4018-ae94-31d0e7119757/universal_laser_systems_vls2.30_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2ba63f-c84c-4398-a135-d7ae05a72b06/dimepavajeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4366ed-2d9e-449a-8db5-f28b3d3c759e/57417376950.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_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 5172 bytes
SHA-256: 9c75bda560ae638d4a5e543a96827676f9087a7b5e8c8583bf9b20de94dd38e0
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 11716 bytes
SHA-256: c32bd918eb3ca2ebdbc5abf154b441b5f8c4cd4d01671674068d6f3057c6e1d8

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