Malicious PDF — malware analysis report

Static analysis result for SHA-256 331d0133ef983290…

MALICIOUS

PDF

81.9 KB Created: 2021-06-08 21:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 49469e43c7f28496bef2dad410b7604e SHA-1: 1d0c2fb7b1c5f2c8ec9f8ddedeb65d8c673a5865 SHA-256: 331d0133ef983290f738421fe2647b1a5ac0923e3d1501cc1f8bc1be908d08d7
186 Risk Score

Malware Insights

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

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 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://infrive.ru/pbw?utm_term=free+gta+5+apk+download+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5fd0a1cf479c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_604b503d937f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_60677803002d8.pdfIn PDF document text
    • https://nakakikixug.weebly.com/uploads/1/3/4/4/134490848/7898932.pdfIn PDF document text
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/rekojejipananesatefo.pdfIn PDF document text
    • https://loloxemevo.weebly.com/uploads/1/3/0/7/130739498/7a1f2.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/83833b516acfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443595/normal_60002e059d0b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9325093d-e6e8-4691-966a-c0ff626e44d3/insinkerator_power_cord_installation_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195ca8b6-ffa5-4675-a153-e52a22c0404f/87729051208.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/how_to_overcome_barriers_of_effective_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e638dded-46a8-4121-a85d-9c9dd5a6c2bc/the_central_idea_statement_in_a_persuasive_speech_is_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db287e40-260c-4e73-9f2a-00cebdf076d1/muzijuku.pdfIn PDF document text
    • http://vikiruji.pbworks.com/f/hot_tub_jet_pump_trips_breaker.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/gigatexitox.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/w/file/fetch/144503580/xoruxozavexezuwisev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d2d9cc-29ed-4cf5-bfd9-dc9508ef103a/luraluxedog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa527e61-7cc1-4e95-9ab3-87d92a948661/britax_marathon_70_g3_car_seat_cover.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/the_bounty_hunter_code_vault_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4941ae5b-18ef-4011-a99d-47ae4ed1c7f7/31598003488.pdfIn PDF document text
    • http://sukagafamo.pbworks.com/f/how_to_clean_kitchenaid_food_processor_attachment.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144419124/zogiborotigapafosa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 5056 bytes
SHA-256: fa06010e1eb56ae326fc90c6cc3696cb96204d364705c7a21f1336b13d7ca083
font_01_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 12696 bytes
SHA-256: b20232fe22b858f74317955913484c95b87d88f45e12442bb0c04873988b0d41
font_02_sfnt_off00012a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A86 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2