Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd151c0e8f13de5…

MALICIOUS

PDF

73.8 KB Created: 2021-06-14 20:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 926b3adfe237204c1166a3881c5edb01 SHA-1: abe2c9573b5889f55bd01f2263f81f992e467191 SHA-256: 5dd151c0e8f13de5fc19eaab52d4b02a11eb92a083fef958b1dc36ecea14376f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/pbw?utm_term=free+download+play+store+app+for+android+mobile PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rizukokodi.pbworks.com/f/70822068529.pdfIn PDF document text
    • http://kejuziz.pbworks.com/f/79765713888.pdfIn PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/144696093/kojix.pdfIn PDF document text
    • http://kefatezalix.pbworks.com/w/file/fetch/144748539/sejarudibolul.pdfIn PDF document text
    • http://kejufavo.pbworks.com/w/file/fetch/145286883/strategic_sales_plan_examples.pdfIn PDF document text
    • http://divogatupum.pbworks.com/f/happy_birthday_images_cake_name.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144459240/nujirogiparipa.pdfIn PDF document text
    • http://rasetewi.pbworks.com/w/file/fetch/144963480/strength_of_materials_rs_khurmi.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144726534/94779295411.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/dnd_5e_grave_cleric_guide.pdfIn PDF document text
    • http://bolotomatub.pbworks.com/w/file/fetch/145241196/the_kissinger_report.pdfIn PDF document text
    • http://fekofowipuze.pbworks.com/f/oru_vadakkan_selfie_movie_songs_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465ef827-bf29-4ab8-bce2-14b479ec31e8/21062981083.pdfIn PDF document text
    • http://bavudexote.pbworks.com/f/10.2_simplifying_radical_expressions_worksheet_answers.pdfIn PDF document text
    • http://nipekari.pbworks.com/f/19377320627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36beeb86-43a6-42a5-9c07-7f53de55b8ef/are_penny_stocks_ever_a_good_idea.pdfIn PDF document text
    • http://jekijuv.pbworks.com/f/kabir_singh_all_songs_download.pdfIn PDF document text
    • http://muvewoxatet.pbworks.com/f/home_alone_2_online.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144426825/slow_performance_after_windows_10_update.pdfIn PDF document text
    • http://ximusutoj.pbworks.com/f/skam_temporada_2_sub_espaol.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144527073/rawoxufaseburamovof.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/w/file/fetch/145145994/33253859177.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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 5476 bytes
SHA-256: da7d5144772b5ff424d5afb9be6d6dc8353e8e399a168137e9f5c4c9ecfc0b73
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10136 bytes
SHA-256: 23ebbd67b6fa3029d47be865961fdd1a5e8f271ecb9fdc04271f647339f09b77