Malicious PDF — malware analysis report

Static analysis result for SHA-256 665c7736a26ed8e5…

MALICIOUS

PDF

68.2 KB Created: 2021-03-12 14:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 00d381bd50d48521ec4a416365a5448e SHA-1: 0ee8c24c0739b1250dfe7d7670d9705f352f6115 SHA-256: 665c7736a26ed8e50519488894bc5f5eee2955ddb6b8b256f50074e53c830222
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://xezojetit.ru/wix?keyword=always+discreet+sample+pack', appears to be the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/wix?keyword=always+discreet+sample+pack PDF link annotation
    • http://sobakin.space/amsterdam_centraal_platforms77icd.pdfIn PDF document text
    • https://serudifatu.weebly.com/uploads/1/3/5/3/135324897/7898603.pdfIn PDF document text
    • http://mon-cmbretagne.best/lofuberobalbjl6b.pdfIn PDF document text
    • http://genusadnlo.space/luduxaxuxoforel1g6zt.pdfIn PDF document text
    • http://trelon.fun/how_to_clear_bluetooth_memory_on_pioneer_deh-6400btyw1ev.pdfIn PDF document text
    • http://vereffka.xyz/friv_hry_Najlepie_online_hry_zadarmcve0u.pdfIn PDF document text
    • http://bettermoneytips.com/save_the_manuals_key_tagl80oy.pdfIn PDF document text
    • https://jajufuwupu.weebly.com/uploads/1/3/1/1/131163717/2077284.pdfIn PDF document text
    • http://zoneeuro.pro/611949038625op4z.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/zapazavutidig.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/cookie_sheet_organizerjulcc.pdfIn PDF document text
    • http://dsv-trening.ru/xbox_360_tray_wont_eject48fy6.pdfIn PDF document text
    • http://raisinsapp.pro/how_to_fill_bobbin_on_singer_sewing_machine_model_6268qk4i0.pdfIn PDF document text
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/dixogobewadotoxet.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/aa4290e888d1cc3.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/7a45524f-a918-4456-92b6-ba33f2e4b2f1/36564508563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1c72e2-4d43-4546-a357-242e0c89d747/george_foreman_evolve_grill_with_waffle_plates_and_ceramic_grill_plates_-_platinum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3d53b8-0dfa-4db6-ae6b-d2b6d61551bc/contrato_de_arrendamiento_sencillo_mexico_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a26d7d-f2e0-4009-b697-23b7d34a6fad/american_history_timeline_1900_to_1950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0a140c-ac89-4b23-9431-6c8b29ee37d9/450171208.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/tumusakaparejapu.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/usb_burning_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb3965c-e7c0-465c-83f9-d3c25e2d9c74/how_to_reset_oil_honda_odyssey_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/76528386748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4375281-5270-48b9-9d7a-d71dc8377076/78291637095.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_off0000ce40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 5464 bytes
SHA-256: d2b73cd016cef5f6c3f6539480ea121b781795ff38ce7f41c0a873758ee3c9fd
font_01_sfnt_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 10204 bytes
SHA-256: 9717f5cd243fdea1e4f9a26066a95a384f2192c0b2bd77b062b70e7d7716e59f