Malicious PDF — malware analysis report

Static analysis result for SHA-256 be723176f526681e…

MALICIOUS

PDF

68.8 KB Created: 2021-03-02 08:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 26ce87381d4f01e52eb19f7c093d9704 SHA-1: cdc89897a2d00690dd1ee9a7a652aa1f1145474b SHA-256: be723176f526681e2254f7315872930065fd88b959904393b92e5e27aee1ec81
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to disposable hosting and exhibiting redirector patterns, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging T1566.001 (Spearphishing Attachment) for delivery.

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://resalured.ru/strik?utm_term=weber+spirit+grill+cover PDF link annotation
    • http://wirobigi.medianewsonline.com/56528707452.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/7124659.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/como_agua_para_chocolate_laura_esquivel_english_translation.pdfIn PDF document text
    • https://belibezininu.weebly.com/uploads/1/3/4/8/134850089/5508797.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/gjaXHjb/88647477013.pdfIn PDF document text
    • http://zuvakaxosamota.22web.org/barnabas_gospel.pdfIn PDF document text
    • https://ripilebaxozeduv.weebly.com/uploads/1/3/4/2/134266308/makarekuwar-fikuzepajolabug.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/mount_and_blade_warband_serial_key_crack.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/judaba_jetinejepije_zaketusog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://finuzajobozosom.epizy.com/forusiwixexibika.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/american_dv_lottery_2019_form.pdfIn PDF document text
    • http://zaravugudag.rf.gd/free_business_card_making_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/seventh_day_adventist_answer_questions_on_doctrine.pdfIn PDF document text
    • http://dadodoserosif.epizy.com/formel_1_boxenstopp_unflle.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/unequal_childhoods_annette_lareau_summary.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/club_car_precedent_accessories_amazon.pdfIn PDF document text
    • http://bexudigibop.rf.gd/android_linux_kernel_version_history.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_off0000d1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 5104 bytes
SHA-256: 3732ffb3560a7c5f0304e6f4a027c547adcb807747ef3be52af892574938868a
font_01_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 10220 bytes
SHA-256: f08830d4a2a3e1df48519b5f4e0cf61d2d04b173a8c2761be3daf239f7d5890e

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