Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d599e04ba0eca2…

MALICIOUS

PDF

76.9 KB Created: 2021-04-02 00:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b2f809885d6c3abb9281b93cf92a8a0b SHA-1: 4faad877f88716dd9620066f39a0cf70dbc3ad44 SHA-256: 24d599e04ba0eca2e0fc90cced07c99c92ff9e2842848722e5781be8bb15cb98
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Anatomy and physiology chapter 3 test answers'. Numerous external URLs are embedded, with heuristics identifying it as a link farm on disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of embedded URLs and the nature of the detection point towards a phishing attack delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/wix?keyword=anatomy+and+physiology+chapter+3+test+answers PDF link annotation
    • http://connexion-amelii.xyz/weather_report_for_today_in_cape_town0dik0.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/52895435479goaec.pdfIn PDF document text
    • http://vir-tus.com/fruits_mania_fairy_rescue14o89.pdfIn PDF document text
    • https://sedemosifov.weebly.com/uploads/1/3/0/8/130874126/75609.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/giU8hgP/lufarerutubudemipugijetuk.pdfIn PDF document text
    • http://winfreeiphone.xyz/where_is_the_lint_filter_on_a_samsung_top_load_washerk3bcx.pdfIn PDF document text
    • https://cdn.sqhk.co/gibiganegaz/duZczJl/hallmark_tv_series_list.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/vghhhsU/kutopevikew.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/Qahdigw/space_marshals_1_walkthrough.pdfIn PDF document text
    • https://fedaxowazujiwiz.weebly.com/uploads/1/3/4/0/134012387/litiwikopudegumif.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoroxur/r9igJjg/17930803753.pdfIn PDF document text
    • http://fomilexavekol.22web.org/44031028973.pdfIn PDF document text
    • http://bostpolamos.site/how_to_read_the_original_rider_waite_tarot_cardstbd4e.pdfIn PDF document text
    • http://teagreen.space/567751071724eajq.pdfIn PDF document text
    • http://smartycredit.info/723040334475jds4.pdfIn PDF document text
    • https://lulezurikut.weebly.com/uploads/1/3/4/6/134667205/linonitopofeger.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/7c309503-951f-4192-8295-d0f98ef88540/boperoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98eabe49-2cb8-436c-bdc1-8a9cf703e921/zazudixijorutubotukot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/619a3a66-c63c-49ca-ba32-ed48dc3337bc/duporumatulef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfeeb683-87ce-49f2-a9c2-422e994cac23/lexisokubarexovisokefop.pdfIn PDF document text
    • http://pipobibof.rf.gd/94261775174.pdfIn PDF document text
    • http://faxumev.epizy.com/68364258597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d65ad2-a7b7-482e-9896-a86c576d0d5a/eric_ries_lean_startup_summary.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_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 5832 bytes
SHA-256: 90b959300cc979d28c3872d767465e398e75e6398c3a222b1de9af5c9876dcf2
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 11088 bytes
SHA-256: d2cad3fcfc38b9998e89b9468c4375533a75a6e4b321c95d8e11e3b6c127f770

Open this report in the interactive analyzer, or submit your own file for analysis.