Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f6d9a37be59593…

MALICIOUS

PDF

126.4 KB Created: 2021-04-22 15:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 99114da35795407eaec114f3dac53baf SHA-1: 5cabe4f900f80a4e818818b3476f2f6a7345ecac SHA-256: 81f6d9a37be59593a058d37c4368d3c21e349d28072f5d00f3bf1579329d9003
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-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://botokaw.ru/strik?utm_term=developmental+milestones+20-24+months PDF link annotation
    • http://vabenawak.iblogger.org/android_request_root_permission.pdfIn PDF document text
    • http://sowadegepixu.22web.org/the_pact_2018_cabernet_sauvignon.pdfIn PDF document text
    • http://zolomakowifop.iblogger.org/makerere_university_fees_structure_2020.pdfIn PDF document text
    • http://manekobe.22web.org/jipogukebex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kisomelug.rf.gd/brahmacharya_in_bengali.pdfIn PDF document text
    • http://misukejijixuke.epizy.com/equifax_credit_report_freeze_lift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ede176-118b-49a7-85fd-4194eba9640a/my_lg_tv_turns_on_but_no_picture_or_sound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743ef422-9c09-4cca-b7fc-727af6094555/45169551905.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/gataroxurupoli.pdfIn PDF document text
    • http://xilijimerufosat.rf.gd/49507164792.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/jivisumili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dabdb2f7-516f-4866-9459-9f5cd30065dc/how_to_update_an_old_garmin_nuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/menor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3629b4-c16d-4190-936b-50a6954d2d81/giwatogupoxojaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea831d2b-6300-46e7-90f3-e3b2f4bbe3fc/braun_thermoscan_ear_thermometer_with_exactemp_technology_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2ee7aeb-0e83-46be-af99-0c117ebfef6a/taranojidubigafifidurut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceef366b-cd9e-4c42-a297-5f5e27bb7226/39288512603.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/carnivores_ice_age_full_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08bd5d31-886f-44d9-be0d-7e7dc42af8db/69715461905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd95a72-d1de-4570-8d4f-1d10e65b506c/reacciones_de_combustion_ejercicios.pdfIn PDF document text
    • http://neriwolesatopux.epizy.com/bunugod.pdfIn PDF document text
    • http://revuzulikasulo.epizy.com/examples_of_permutation_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/pikajovanituxubalu.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_off0001b46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B46F 5416 bytes
SHA-256: 8dd42ded0f614a8cc89fcd70b6ca477ef4dc50a30b94d6b79523d2f129b6cb6c
font_01_sfnt_off0001c6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6D0 10868 bytes
SHA-256: 49c368a6be915a58ed9f38497e1a4364b7d29c027e0ab83cf36d1c2da951a462