Malicious PDF — malware analysis report

Static analysis result for SHA-256 828e8407308759a7…

MALICIOUS

PDF

77.7 KB Created: 2021-03-20 00:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 571b9d58c44e18dc1660bff484ae87c9 SHA-1: 2b004d0a41cadcf89d2d4d21c400d284ab61f3ff SHA-256: 828e8407308759a72a67dd3ab1b4ee4a936d47a81b72e39f78abd2e33356cde4
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. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's primary purpose is to act as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=technology+platform+business+definition PDF link annotation
    • http://nature-ital.space/japowovikivt8r1v.pdfIn PDF document text
    • http://copyright-rules-help.com/jesixologimezisubewarunzongt.pdfIn PDF document text
    • http://bachanalytics.com/fafozunuwanakamegarull6mkx.pdfIn PDF document text
    • http://startbastar.online/notowezunojkvy7m.pdfIn PDF document text
    • http://peskomment.ru/what_activities_do_scouts_do_in_australiathelk.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/advantages_and_disadvantages_of_computerized_accounting.pdfIn PDF document text
    • http://4kuhd.me/2117819745vzuu0.pdfIn PDF document text
    • http://fullhp.info/uclear_hbc200_for_salegys63.pdfIn PDF document text
    • http://lidlid.xyz/roxuneznc1jd.pdfIn PDF document text
    • http://italia-doc.space/og_mandino_books_for_salehwcml.pdfIn PDF document text
    • http://sodahq.pro/16064450340bg946.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/if_formula_in_excel_2020_with_example.pdfIn PDF document text
    • https://bajipupetezin.weebly.com/uploads/1/3/5/3/135315063/puxozubomopenin.pdfIn PDF document text
    • http://copyright-helps-team.com/39278346798w4v3p.pdfIn PDF document text
    • https://muvepabeburok.weebly.com/uploads/1/3/1/4/131453329/fikewugasujenek-gaked-mufimufi.pdfIn PDF document text
    • http://frukt.space/96389118917e7scp.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/ced64fda-87dd-4ec8-a334-efd5c0187922/watch_conversation_with_god_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d1cfd8-5f8b-40d1-a4dd-d1632bb0e656/non_finite_verbs_exercises_with_answers_for_class_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/641a234e-078b-4197-848f-4dabb2e34452/razer_blackwidow_ultimate_stealth_2016_manual.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/mokerejopik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a904504e-8827-4f6e-9053-bd7ec4ce3a46/bisojeverubitafamigajek.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_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 5760 bytes
SHA-256: 9f361c21d128158a6e75414d5070074d50a867954628f2155b407fdf6a59f3dc
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 10956 bytes
SHA-256: d03ab490910a070fa51c2094d3c6087fd5230e19636d8887873fabc4a8900ae9

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