Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb92cf2579ae6e23…

MALICIOUS

PDF

75.0 KB Created: 2021-03-12 08:36:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65c03620f7c9ac58b10b84487942ca3e SHA-1: 14901c24b71d634ee36d34a71b3eca377040068c SHA-256: bb92cf2579ae6e239fe9f4a2f8135d038cba8044dd3b726554358338bd43188d
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 0.9996

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://xezojetit.ru/123?utm_term=choice+theory+glasser+pdf PDF link annotation
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/pigifatix-kuxemegasalibe.pdfIn PDF document text
    • https://tebixuku.weebly.com/uploads/1/3/4/5/134595315/tonatalanid.pdfIn PDF document text
    • http://mofonuf.medianewsonline.com/kazirij.pdfIn PDF document text
    • http://jefuvumerusew.getenjoyment.net/causes_of_poverty_in_rural_areas.pdfIn PDF document text
    • http://wudaxozibutix.sportsontheweb.net/bajopufoz.pdfIn PDF document text
    • https://gejosubirimo.weebly.com/uploads/1/3/0/7/130776575/noliwumeje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b61972-3155-475b-bcdb-4e82962eabc0/831274901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e24d147-10d4-4bd7-a9e2-94662d724fce/schwinn_airdyne_ad7_console.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1424d7a-7093-4903-85eb-600ff6d436a3/funko_pop_harry_potter_advent_calendar_2020_characters_list.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/99676996902.pdfIn PDF document text
    • http://jokosen.atwebpages.com/iso_22000_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b426d931-4eeb-4104-9a77-ba113c3449fb/pokemon_emerald_what_to_do_at_lilycove_city.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5cf78a-85ed-4238-b0bb-57415b7c28b8/preposition_exercise_for_class_7_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35c35e0-6cb4-40e0-9719-fee08c32a1cb/aeron_chair_size_c_seat_width.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/weber_gas_grills_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44eede84-3282-4b65-a64e-de240cefe4c6/rhino_tutorials_architecture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815b3a8c-58dd-433b-a2aa-f5c105daa2f7/how_much_does_it_cost_to_renew_ma_drivers_license_in_ghana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da89bf90-199b-4326-9f7e-679798001e05/google_maps_street_view_history_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e611f2b6-9e02-4e59-b84a-4ce6c10cd39c/42534202629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d9df8f-aff8-4bdd-bc47-38b2e6e3e1da/fukugenijake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae97028-4218-440b-b404-5da846aeb2f4/dell_poweredge_2950_server_memory_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b082cb7-0764-4291-b93e-e0ab254157d0/types_of_house_wiring.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_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 5424 bytes
SHA-256: f8f433f16a524e56885af94e995605a09562027cdb0affa5d7a968f803d4c2f6
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10640 bytes
SHA-256: f30b3c1cd6390cb4e3f514cbcd0821a5bc6a1769d1a3c61e51d914003f2679ec