Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a3e28a734779b3…

MALICIOUS

PDF

72.9 KB Created: 2021-06-07 15:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a1b2b413835d86427642027ec3fc21d SHA-1: e72093939d3b9e59373b2b4de047d5feaad3c03e SHA-256: d2a3e28a734779b3fa7403e452af427a71180df9a51edad42127785112154479
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 0.9956

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://medvor.ru/pbw?utm_term=bleeding+time+and+clotting+time+definition PDF link annotation
    • https://tusukufuduma.weebly.com/uploads/1/3/4/4/134458322/dolufesik.pdfIn PDF document text
    • https://ropojagininu.weebly.com/uploads/1/3/4/6/134635708/6617598.pdfIn PDF document text
    • https://vadewowiruku.weebly.com/uploads/1/3/1/3/131382700/punisuwekediruki.pdfIn PDF document text
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/dovinisulatu.pdfIn PDF document text
    • https://pelifofenap.weebly.com/uploads/1/3/3/9/133997555/noxusomo-jubaxo.pdfIn PDF document text
    • https://karuxuli.weebly.com/uploads/1/3/4/3/134377251/wolejaxuz.pdfIn PDF document text
    • https://gekawemugib.weebly.com/uploads/1/3/4/6/134623466/4725633.pdfIn PDF document text
    • https://rumuzejisu.weebly.com/uploads/1/3/5/3/135349165/4806f124441505.pdfIn PDF document text
    • https://debexubomes.weebly.com/uploads/1/3/4/8/134881130/8655762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebenuziwi.pbworks.com/w/file/fetch/144604560/what_size_is_32_in_jeans.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/w/file/fetch/144670809/programming_data_structures_and_algorithms_using_python_nptel_assignment_answers_2020.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/w/file/fetch/144537849/where_can_i_get_enduring_power_of_attorney_forms.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144469842/78899940224.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144626490/2005_nissan_frontier_transmission_solenoid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2038b46e-5c81-4f16-b75b-d117cad42cce/zugog.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144670857/libro_de_matematica_de_tercer_grado_de_primaria_minedu_2020.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/f/how_to_remove_disc_from_ps3_fat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b5fcda-adae-4db7-b713-0920916a2fc8/59788854865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ed0f5b-9935-42fa-92c0-63b45bc821a8/chaos_theory_wow_achievement.pdfIn PDF document text
    • http://vevokofeju.pbworks.com/f/nifadokaxivedalo.pdfIn PDF document text
    • http://favixose.pbworks.com/f/18039386271.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/w/file/fetch/144444411/xudetuxolizopipimipon.pdfIn PDF document text
    • http://xuwajesorewo.pbworks.com/f/exercices_conjugaison_pass_simple_cm2_imprimer.pdfIn PDF document text
    • http://suniger.pbworks.com/w/file/fetch/144744474/58023723452.pdfIn PDF document text
    • http://finebov.pbworks.com/f/gudugatonupude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b853653b-2a29-4599-ba97-fbb1971e6eeb/astro_a20_headset_not_working_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7a6685-6057-4f79-8f18-ecb110634d6d/uk_police_ranks_military_equivalent.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/w/file/fetch/144637725/how_do_i_reset_my_polk_sb1_soundbar.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_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 5116 bytes
SHA-256: 92f1934c1c4bb5f5841db1550abb97d9d37ec079e444c6990c6c35fe104542bb
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 9700 bytes
SHA-256: 811e71e6af3c23712fe482ef6447879b63ef9568a6c7d50118b9c4a63237502d