Malicious PDF — malware analysis report

Static analysis result for SHA-256 be50bee25e6ca051…

MALICIOUS

PDF

70.6 KB Created: 2021-06-05 05:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8a79e5a59cb6c080201c3c649cc95969 SHA-1: 529daf311804d4de257990c41ba08f563e62deae SHA-256: be50bee25e6ca05160cd62e77c30748ffeaafa476a7c977521cbd66be6ec79a4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of an embedded URI and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=applique+letters+free PDF link annotation
    • https://zukunade.weebly.com/uploads/1/3/0/9/130969607/wanuzivulubapi.pdfIn PDF document text
    • https://pipulelinukebe.weebly.com/uploads/1/3/4/3/134364851/3735109.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/ridamomoritumed_faxosetakedeko_felusupitabe.pdfIn PDF document text
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/1511708.pdfIn PDF document text
    • https://nigizamizu.weebly.com/uploads/1/3/4/3/134319440/dusijexalek-ziteg.pdfIn PDF document text
    • https://nixifekenebuj.weebly.com/uploads/1/3/0/7/130775280/2373329.pdfIn PDF document text
    • https://nuxelimifa.weebly.com/uploads/1/3/0/7/130776070/ef9da2d9995.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144487617/rise_of_the_super_germs_science_world_answers_september_17_2018.pdfIn PDF document text
    • http://pefumugat.pbworks.com/w/file/fetch/144543768/heat_treatment_of_copper_alloys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd901b0-7cf2-4da6-ac55-bf2054f0287f/diablo_2_lod_multires_1.13_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7eab61-e456-4ec1-ac5b-db721c1709f0/civics_and_ethical_education_module.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144416424/22435826111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bbdef4-c2d8-4665-b5a9-c4c049451577/11109828336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28739a8c-025d-4a89-9baf-4cbff386d618/how_to_replace_power_recliner_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ced527e-c8ae-448c-880e-ab44ac587d9c/what_causes_garage_door_remote_not_to_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc23e8f-90ba-4c90-b708-482a0fc53609/japimid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c22068b-a2c7-4241-bb4d-10c35f01f20e/pgh_police_zone_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc930303-8661-4555-a76b-5805ad04a488/the_sexiest_man_alive_2020_nominees.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/w/file/fetch/144562938/el_gran_grimorio_dragn_rojo_wikipedia.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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 4800 bytes
SHA-256: a10124f9fbf78540256965a7a56afe3a818dfe0ee27653d041614fec7205eaf6
font_01_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 11068 bytes
SHA-256: 52e48293ef203a8e91acb33be75faac3ab5b859f5a38c7a68807a64bd6e4b91b