Malicious PDF — malware analysis report

Static analysis result for SHA-256 70be6dc887df1f87…

MALICIOUS

PDF

70.7 KB Created: 2021-04-04 09:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8d1d82cb7c00050534bd9dc1fec492cf SHA-1: 220e1cb47d62e6ffc27dcf418cc5496fb4db30d2 SHA-256: 70be6dc887df1f87bf4a72c949873920d0226f02eaabc7b9f17b6e3b0f5a62a3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to 'fokemale.ru', identified as a link farm on disposable hosting. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The document body, though heavily obfuscated, suggests a lure related to 'journal writing descriptive text'. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/award?keyword=journal+writing+descriptive+text+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456143/normal_601f308d11ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6052a7d883a61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5ff257f9727fc.pdfIn PDF document text
    • http://xuzunebizojebab.22web.org/advanced_english_test_teleperformance.pdfIn PDF document text
    • http://rijivago.iblogger.org/tasezumobenanudu.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/how_to_set_alarm_on_panasonic_cordless_phone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_601d5b8c578e5.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/00f349ae-5b31-41ed-9205-1e83d0c63fbf/91126178082.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/difference_between_audio_technica_lp60_and_lp120.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/marine_corps_physical_fitness_program_mco.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/how_long_are_army_ranger_contracts.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/rawutobepuzub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b581d463-0c28-4e69-abd5-371aa213b31a/laratopukifejajowekevid.pdfIn PDF document text
    • http://vupikefugogulup.epizy.com/15474561904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecdd9d21-a9ea-4e70-86fc-3bee9159432b/intermediate_microeconomics_varian_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c079de6c-f209-4622-9cf3-3443bd130aa7/line_graphs_worksheets_year_7.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/dorelifibavomar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b640c4fa-d05d-44f5-a959-457a9e6ba38b/boguzokobunokebujoxene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464ef900-9aa7-4a9c-bd7a-ab51298269c7/fisher_price_infant_to_toddler_rocker_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff621f7-61c6-465f-b3e0-e828a00159eb/marvel_comics_sword_logo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cc4649-e3ec-497d-9565-d84dab344aed/lukigurufif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34b5b2c-9f1c-494b-8e32-f60af31ea578/dometic_ac_manual.pdfIn PDF document text
    • http://modujufuwalali.rf.gd/chronicle_of_a_death_foretold_narrator_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/how_to_check_if_gre_score_is_received_by_university.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_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 5532 bytes
SHA-256: 846e179ca56803ae72d8fbab2792aae569c295e7b5df166261fec34cb8d49965
font_01_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 9776 bytes
SHA-256: 0434517effb9f3856fe6fbeeb63704e9d43641e87d55974397aeb07a37cd0f58