Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0a774bbb477046…

MALICIOUS

PDF

77.9 KB Created: 2021-02-13 03:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f99c7f5f949bd61a5834c3033b51f6a9 SHA-1: ab2aad5265b2ef39a11f2feccc56b9202b0573fe SHA-256: bf0a774bbb477046c6a09bdc139b365784a7414d8507ad8930e3469e0aeab32d
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, suggesting it functions as a link farm designed to redirect users to potentially harmful websites for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=characteristics+of+an+armor+bearer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481397/normal_6009b88c1cc99.pdfIn PDF document text
    • https://wotixefutakit.weebly.com/uploads/1/3/2/8/132815753/burukura-kumaxesabepesez-vepamigobux.pdfIn PDF document text
    • https://cdn.sqhk.co/duzokezubeka/rhiiRmq/mine_legend_idle_miner_gameplay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499282/normal_5fc814abf38b3.pdfIn PDF document text
    • https://fasadosuz.weebly.com/uploads/1/3/4/0/134012998/zireforuzive-dareginizifor-mojir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385612/normal_6007e6a9b63fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5ff75f6a489de.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/zukuranovuxusu.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/wUysic2/virus_vs_bacteria_comparison_chart.pdfIn PDF document text
    • http://1xbet-registrat.site/air_new_zealand_app_for_androidmlpmq.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/2033448.pdfIn PDF document text
    • https://cdn.sqhk.co/jefutubup/RoXg8ge/59044673863.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/egdha3h/pimetavujigode.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/8gc3TDR/7870417590.pdfIn PDF document text
    • http://iranianvc.com/stephen_levinson_pragmatics4e4rp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_601f271122bf9.pdfIn PDF document text
    • http://xumegexujarev.22web.org/amcrest_outdoor_camera_manual.pdfIn PDF document text
    • http://mscgis.net/asus_camera_driver_windows_10eozse.pdfIn PDF document text
    • http://prostosite.site/machine_gun_sound_effect_free_downloadppvej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 5132 bytes
SHA-256: 61860deff6bd65e4e914164754b53fcd481c509397d580f22872692165bd80b8
font_01_sfnt_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 11152 bytes
SHA-256: 601538d24fb2ec78b6e90f325c7b7d77f800262bfccb693a92566b4177f03d8a

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