Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7bba7a978b848b…

MALICIOUS

PDF

136.7 KB Created: 2021-06-01 05:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 87472c0111bc6c170fd1aa22e0ce99e0 SHA-1: 1a71db51a3ab11a9e1640a65e891eca8e077218e SHA-256: 5d7bba7a978b848b6e8729de84722ca9a5fc1518707186d244ae89994cfad287
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on disposable domains. The heuristic 'PDF_SEO_LINK_FARM' suggests this is a deliberate attempt to create a large number of links, potentially for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/pbw?utm_term=what+is+philosophy+of+pragmatism+in+education PDF link annotation
    • https://dakubotamijez.weebly.com/uploads/1/3/2/7/132712147/5101799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_5fe810d98edab.pdfIn PDF document text
    • https://jugivukovetid.weebly.com/uploads/1/3/0/7/130739525/2304648.pdfIn PDF document text
    • https://tasunukalen.weebly.com/uploads/1/3/4/8/134888382/3107169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_6066f9c9d176e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_601e05beb43da.pdfIn PDF document text
    • https://kiwaposuxixu.weebly.com/uploads/1/3/5/3/135329520/pazalabipotuw.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/rijenexewun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449009/normal_60103cdfcd1cb.pdfIn PDF document text
    • https://regajuwanuduxis.weebly.com/uploads/1/3/4/3/134319991/a30d00.pdfIn PDF document text
    • https://sevizigetumopib.weebly.com/uploads/1/3/4/0/134042829/b7c14e8730a3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4424645/normal_60b5995981331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144433836/driver_para_sonido_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4f3ead-1d88-4f98-ae58-a70a5c92aeae/how_big_is_a_football_field_in_meters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690238e9-a3c7-4108-947b-621fc0199e4d/81128273106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73fd111c-475f-4fca-855f-25f09af00cc9/ravakivabagipawosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84600c6c-28e6-4679-ac71-14a7e2af9228/how_to_do_21_day_sugar_detox.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/suzuki_ensembles_for_cello_volume_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b3cb6b6-7c8d-42a0-abaf-01c5acedf0df/le_petit_nicolas_characters_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6fce7c-b560-415b-8d77-7bd2f8ac54fa/watamuzuxotul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db794481-481e-4b12-abd1-325319ab6705/30322187011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/638dac12-707a-463f-bf08-2afa88c0b64e/gaxibodotakuk.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_off0001dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAE9 5684 bytes
SHA-256: 45c2fbaf038cd57de51d22a1d405ee2894ab67e0f4ce8f8d5b2606edb6ca0b53
font_01_sfnt_off0001ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE2D 11508 bytes
SHA-256: 6183bd1d7416484166412c09d888dbe772ee646d2344650c233b1552d7660d5f