Malicious PDF — malware analysis report

Static analysis result for SHA-256 6143d3fa98aa556b…

MALICIOUS

PDF

72.2 KB Created: 2021-02-05 06:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 72eeff08e3274b91822cef3ebd45ec2f SHA-1: dc2a63b0976865071e4eb5ca3d81e8c8475f0d60 SHA-256: 6143d3fa98aa556bd4855a2eaea11be66f9f662b9f2b0c646c4859558f8ea532
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, with one prominent URL (`https://jottigo.ru/aws?utm_term=saucony+guide+womens+canada`) identified as a potential lure. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a pattern of creating numerous links on disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://jottigo.ru/aws?utm_term=saucony+guide+womens+canada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367279/normal_601bb2970fd55.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/gRgijeH/winavawotoxugu.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/cjciegc/iready_romance_fiction_and_novels.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/chd5gjJ/cops_n_robbers_game_online.pdfIn PDF document text
    • http://expressday.online/wrong_turn_7_full_movie_download_in_hindi_dubbed_300mblbbrj.pdfIn PDF document text
    • http://lnstagram-office.com/262307694107pzc6.pdfIn PDF document text
    • http://zojulosopejozaz.iblogger.org/96061512548.pdfIn PDF document text
    • https://zuborezebakit.weebly.com/uploads/1/3/4/6/134638686/fovaxutof.pdfIn PDF document text
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/5594611.pdfIn PDF document text
    • https://ca-cdn.runningroom.com/pub/media/catalogIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/nidazeb.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/cbse_net_november_2017_answer_key_official.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/70264858766.pdfIn PDF document text
    • http://nisegup.epizy.com/niti_aayog_annual_report_2018-_19.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/firefox_older_version_for_linux.pdfIn PDF document text
    • http://lipisalozolujew.epizy.com/antivirus_program_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 5232 bytes
SHA-256: f65d12304a1dbcfc22c69e41aee47b2a78fad4cdd2de38b7d680f112de9e7153
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 11080 bytes
SHA-256: 318b86f288fa983d9749f1bf0f2f9775a3c2f35f3e18daff05f161c219dac513
font_02_sfnt_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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