Malicious PDF — malware analysis report

Static analysis result for SHA-256 2735f952ad501dee…

MALICIOUS

PDF

76.6 KB Created: 2021-04-09 17:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3227ec1ed5d42e227a184a0c81168c37 SHA-1: 706c2fe3fa826ea61eeee9a80d622a7e0053d64b SHA-256: 2735f952ad501dee65bf8e4bc95f317ded67b5493f475f1b576bdc0a0deae439
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 0.9960

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://soxebez.ru/strik?utm_term=snare+drum+practice+pad+xymox PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464522/normal_5fcfa08e97408.pdfIn PDF document text
    • http://puruzil.iblogger.org/logo_game_answers_expert_pack_37.pdfIn PDF document text
    • http://kenuzerelo.22web.org/government_maternity_leave_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_600b55c3c3c71.pdfIn PDF document text
    • http://tumibejum.iblogger.org/architectural_design_elements.pdfIn PDF document text
    • http://sanezukevuzav.iblogger.org/vertical_axis_wind_turbine_ppt_free.pdfIn PDF document text
    • https://topipanonotege.weebly.com/uploads/1/3/4/6/134679812/21898.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/9274155.pdfIn PDF document text
    • https://todusoxi.weebly.com/uploads/1/3/3/9/133999566/tavolegerikite-xugupagux-lawisewaludub-patoxolebomi.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/890399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385207/normal_60047e9a4f974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5fe83408d6f80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pufalidupoge.epizy.com/69157952505.pdfIn PDF document text
    • http://jobubiro.epizy.com/72572086591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23543dce-1c9e-4b2c-b7e7-36cef317afe8/61570904799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b706fd3-78ac-418f-b942-06b56ddb59a7/5_dysfunctions_of_a_team_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7093562a-0b25-483b-b8ce-3257b56c3828/sheriff_of_nottingham_game_2nd_edition.pdfIn PDF document text
    • http://topagujowulefe.epizy.com/68193731869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4caceb55-6914-46dd-a451-fd48753b59fd/hp_laserjet_p2015_information_page.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7f5996-4a3f-49de-b582-be3812bb77cb/what_does_raziel_mean_in_hebrew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa430c3-6e2c-42a8-9316-c9005384a16d/4170253721.pdfIn PDF document text
    • http://jezuguxefigowi.rf.gd/encyclopdie_plantes_mdicinales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb47cc80-dc66-47e7-936d-71dfa7c2f07e/fujitsu_halcyon_blinking_green_light.pdfIn PDF document text
    • http://mefetapa.rf.gd/dometic_ct_thermostat_reset.pdfIn PDF document text
    • http://nunoxemimo.rf.gd/the_timeless_way_of_building_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1072a6fb-f5dc-4b15-bd8d-6f30aa4f3edd/mask_of_the_red_death_full_movie.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_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 5284 bytes
SHA-256: a8952716c84798c354a947a69ff96c1426494c1993a18873b09a5866e89b02a8
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 10492 bytes
SHA-256: 4587179886c1b188d4b0a79ccaf9bfc0098d9c5dbc6d567e875849dc25a2b9fc