Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1c3064f4935f1b…

MALICIOUS

PDF

77.6 KB Created: 2021-05-03 21:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6cde83734d2dca4ea5bc046c404706b6 SHA-1: 9e67f4283311e5085080c6445a3e4398cc9b0132 SHA-256: ba1c3064f4935f1b2c30584fff25b6a352e5185aee2effa518b3e0b6957fd779
126 Risk Score

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 0.9998

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://crophysi.ru/strik?utm_term=wine+for+dummies+pdf+free PDF link annotation
    • https://cdn.sqhk.co/gulifunanale/2HkJyAO/4061321093.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/7542118308.pdfIn PDF document text
    • http://gixitetopes.scienceontheweb.net/exercice_accord_auxiliaire_etre_et_avoir.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/22413990328.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/agdUFD5/yellowstone_season_1_episode_3_summary.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/agenda_docente_2020_para_imprimir.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/jdhbha6/best_r_b_hits_2018.pdfIn PDF document text
    • http://lotto-investclub.com/all_power_rangers_theme_song02zh5.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/84079703312.pdfIn PDF document text
    • http://cuzinfo.ru/vofuwwn4xz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/vemagug.pdfIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_91f4965957744bc196050c16e62d3e9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/blue_yeti_mic_stand_australia.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_bfa6cdaebf1145d8b7b277d225311d91.pdf?index=trueIn PDF document text
    • http://nosigegu.onlinewebshop.net/34943520676.pdfIn PDF document text
    • http://fuvuxejuv.myartsonline.com/xozuvalaraf.pdfIn PDF document text
    • http://pedamodaw.onlinewebshop.net/dosilifuzefofolapuwulola.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_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 4960 bytes
SHA-256: 424a6e367c85d494557ddaf4ccd0e5288f94d0abf34ea737471ac923d6f843db
font_01_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 11924 bytes
SHA-256: 99528ebbbd00ef25b7962eef3e9a2fbbcab6cc5c0a67def7c0046f89b8fbcfc9

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