Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a4141b309c73fa…

MALICIOUS

PDF

84.0 KB Created: 2021-04-07 21:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 77e50385fc2e4d76ba2fadf8c5b524a1 SHA-1: 268e04f300d9d6e4ce65587944f4055d7427b6ce SHA-256: 98a4141b309c73fab4c29cba3f7e817f91ef090d8c884921bfcdf10db3d338a6
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with several pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=gray%2527+s+anatomy+review+book+pdf PDF link annotation
    • http://wutujirola.22web.org/what_is_bells_palsy_in_hindi.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/csSEs0A/28096774718.pdfIn PDF document text
    • http://teguruta.medianewsonline.com/examenes_cae_con_soluciones.pdfIn PDF document text
    • https://cdn.sqhk.co/gikokimofegi/17gdleV/33840862509.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/kjfig0e/versatile_full_sew_in_no_leave_out.pdfIn PDF document text
    • http://xatasawijuli.22web.org/75248929428.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/badegetamewad.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/4Dgdgjq/free_bobolebobo_song.pdfIn PDF document text
    • http://tupujetu.sportsontheweb.net/fundamentals_of_engineering_economics_3rd_edition.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/richard_bandler_frogs_into_princes.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/is_my_toshiba_a_smart_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/pupoxobumake/giiRgii/top_30_hashtags_for_instagram_followers.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/basic_logic_gates_and_boolean_algebra.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/bda_bye_laws_2020.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/fokawekikizolo.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/incentives_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedokonox.rf.gd/landice_l7_motor.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/35726584047.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/lightning_thief_chapter_22_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/kekarowivi.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/panasonic_repair_centre_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/jerikajagirozizaxunozoxa.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_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 5676 bytes
SHA-256: df93e4372c4fda1c2030c9307b2cf17b4c0f24d8687526c60f9347a0960769cc
font_01_sfnt_off00011ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE1 11164 bytes
SHA-256: 7330a208abfb6b08b16c6cf02700b6663ca459625ec55ed5f3589fad44f50f46

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