Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3ee4f05fed80f0…

MALICIOUS

PDF

74.7 KB Created: 2021-06-11 20:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 708283c4cd5d1220a364ca873cbfa1cb SHA-1: 04751873f95be591e409e040bb0e7af44bc77192 SHA-256: 5f3ee4f05fed80f016968d9e07f967f634d995a4cd1ffa084f00beeb94972eba
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion pointing to disposable hosting services, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://huntic.ru/pbw?utm_term=super+deepthroat+android+download PDF link annotation
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/sagen_dagolaladipok.pdfIn PDF document text
    • https://rogopinekesake.weebly.com/uploads/1/3/4/3/134378395/mejipoxelis_wibibuwusimel_besefawejex_kitav.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/4564444.pdfIn PDF document text
    • https://nironaguvotu.weebly.com/uploads/1/3/4/5/134530025/8254469.pdfIn PDF document text
    • https://gejeliruvuke.weebly.com/uploads/1/3/4/6/134699680/ddd878b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fisojun.pbworks.com/w/file/fetch/144958662/kojugosevefizitijusago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d60555f-85cf-4919-aeab-47c12a57f052/how_to_put_on_a_kindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d85689-6ce9-40fc-831a-e335645a4693/28034962974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07ff3ce-b12e-4ef9-b74a-784e295e653e/air_fryer_cookbooks_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f79cd1f-8cae-4e1c-8f25-fe6ea8c177ca/a_sample_candle_making_business_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df84be4-9de2-426e-b90e-7ba2b3baed6d/secret_life_of_plants_documentary_video.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/f/ejercicios_resueltos_de_tecnologa_3_eso_editorial_teide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26107954-bfa2-4c16-9b53-d095cbbed3b6/ocarina_of_time_3ds_master_quest_big_poe_locations.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/w/file/fetch/144714783/how_do_you_pronounce_draco_malfoys_dads_name.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144545565/biuret_protein_assay_principle.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/yamaha_f150xb_outboard_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab8429f-751e-4121-a50a-d67ce85d7fb6/47354554604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b719f1-4635-472d-b881-58eb8a5235cd/what_size_does_brandy_melville_fit_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4caff4ba-6974-4452-9304-c19c19054410/yard_machine_lawn_mower_parts_canada.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/f/sijujidulomasugixiworu.pdfIn PDF document text
    • http://pudomasepok.pbworks.com/f/dipiwej.pdfIn PDF document text
    • http://gepefupugalu.pbworks.com/w/file/fetch/144721359/70754241936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2c4980-b7f6-4281-8080-f71cf080c493/the_betrayal_of_east_pakistan_bangla_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d870dd1-61f5-4156-9873-96360ecca96c/jotab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6df17b8-acc4-43ed-bf62-14f5bf19f35c/how_to_setup_tv_volume_on_dish_remote.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_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 5064 bytes
SHA-256: ce446a4117631285b97148f71794dab68c185642b9b19f42d41a49dddf6bd8ad
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 10456 bytes
SHA-256: 7f8d635330e4266bcd72fa61b68b9858416cb3ecaab412af9175a4466b6e6fbc