Malicious PDF — malware analysis report

Static analysis result for SHA-256 9770de88ec32dd6f…

MALICIOUS

PDF

80.0 KB Created: 2021-04-02 07:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0204343b6577c9a3fa13fe354b7a678f SHA-1: 681de1235100f46ec09a61af35e9599a731ca323 SHA-256: 9770de88ec32dd6f1b6faa59a74f5cf0b44ab723dff59039c17967bf620c4bdd
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs, particularly 'https://seumenha.ru/wix?keyword=mummification+instructions+worksheet', suggest a phishing or malware distribution lure. The PDF's structure and numerous links to disposable hosting further support its role as a malicious document, likely intended to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=mummification+instructions+worksheet PDF link annotation
    • https://cdn.sqhk.co/kodivitedi/j4OifM1/stars_live_wallpaper_apk.pdfIn PDF document text
    • http://nuturejedekaw.22web.org/benefits_of_virtualization_in_cloud_computing.pdfIn PDF document text
    • http://ravitidi.22web.org/situtuluvotelelozejepo.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/Nje9icv/47783325201.pdfIn PDF document text
    • http://boderuj.iblogger.org/69351778887.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f3d7f5-4e11-493a-8bff-ca53c76d546b/wiley_custom_learning_solutions.pdfIn PDF document text
    • http://sisigetevi.rf.gd/67018507298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bff4cf5-fe67-4283-9319-8af08c609652/96731767519.pdfIn PDF document text
    • http://pozadel.epizy.com/aparato_reproductor_masculino_histologia.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/22167424323.pdfIn PDF document text
    • http://nusemid.rf.gd/warhammer_40k_6th_edition_rulebook.pdfIn PDF document text
    • http://duzobujunetokuz.epizy.com/bozuxuzudilasasokowagediv.pdfIn PDF document text
    • http://titedilera.rf.gd/africa_toto_piano_sheet_music.pdfIn PDF document text
    • http://bosewavim.rf.gd/gubulomaberiwizar.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/portrait_drawing_techniques_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/bob_revolution_double_jogging_stroller.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/picture_frame_template_for_preschoolers.pdfIn PDF document text
    • http://dukedofabi.epizy.com/83007333216.pdfIn PDF document text
    • http://mebuwakubir.rf.gd/menjadikan_file_jadi_satu.pdfIn PDF document text
    • http://wugupijejituzog.rf.gd/zazakadir.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_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 5248 bytes
SHA-256: 89847dbd652593440d74d609805f20a81ff5c43ff62529d77674355863d91988
font_01_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 11840 bytes
SHA-256: 9ebcb62b9ef3cb54ede7ae24bc010646c67433f8881bae1c0c222466e5d69748

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