Malicious PDF — malware analysis report

Static analysis result for SHA-256 99111d360f4d5fc9…

MALICIOUS

PDF

74.6 KB Created: 2021-03-25 20:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0f2c22a784a5327626863bd32fd8c32e SHA-1: 0f3586482d66d38b3ac3f6aacf6def08fe06572a SHA-256: 99111d360f4d5fc9fae4d49655031c975729624d6edefd083674e3f2a3b17a65
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to disposable hosting, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing lure designed to redirect users to malicious sites.

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://dugedepap.ru/wix?keyword=quizbowl+literature+study+guide PDF link annotation
    • https://cdn.sqhk.co/silutoge/jijYRje/adobe_acrobat_reader_direct_link.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • http://italylife.pro/algebra_worksheet-_section_10._5_factoring_polynomials3qhl9.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/sje7jdK/30479442365.pdfIn PDF document text
    • http://fragcups.com/first_break_all_the_rules_interview_questionsn3zc8.pdfIn PDF document text
    • http://electorat.org/how_many_calories_in_bojangles_sausage_egg_and_cheese_biscuitiiaap.pdfIn PDF document text
    • https://cdn.sqhk.co/jigekuragige/YxOwgcG/foputuvudizulob.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/fUhfVzh/skateboard_party_3_lite_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/uBhheRZ/8226357981.pdfIn PDF document text
    • http://creditscorefix.info/buell_xb12ss_owners_manual2v4v5.pdfIn PDF document text
    • http://virona.org/wuwuzed03lsv.pdfIn PDF document text
    • http://fapseo.ru/jinuguvifan2fp0.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/5f86ab61-3086-4d91-be31-57368884ddc0/how_to_find_the_exterior_angle_of_a_10_sided_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf70b75-4a21-42f7-b182-23f193e8997b/dipugepofej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fabd298b-ac2c-41c0-b327-144e72e99076/how_to_troubleshoot_zoom_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7b0011-d882-4da4-9c14-fbed41f8cd57/54716332569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/851702b5-5961-4677-839a-4c4e37e40ded/723541852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76f5478-65fb-443f-8d4a-1354fa94c014/69950858947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ca88af-b42d-432c-af53-550983054523/vasikiwugitowab.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_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 5440 bytes
SHA-256: 436679d9a9aa294bfdecf5e57e213899917a3715e5cedd2d71d07f30a86bfcdd
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 10464 bytes
SHA-256: a0eeed9f57d0f95bd3e777ce9ac1e131d9f637dc6a9219bbc06915e6d3a7f0e3

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