Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3b39a39a4d37d3…

MALICIOUS

PDF

71.5 KB Created: 2021-03-23 15:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cbc48f80fb78da886162fd71577a52d2 SHA-1: 105328481267958f1fa5ef3192e1fa9e9a44a999 SHA-256: bf3b39a39a4d37d32ae869cdfce12486ff73504d4b3ea913fb7efa89673a1c4f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://vilenefex.ru/123?utm_term=prepositions+among+and+between+worksheets PDF link annotation
    • http://agent-spv.space/best_cars_to_buy_dirt_rally_2._0wxsh1.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/hcGgfgf/prison_break_season_4_cast_secretary.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/ciKQjg3/pacific_fire_protection.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/pTjahgB/charades_online_animals.pdfIn PDF document text
    • http://apeech.ru/mary_poppins_returns_cast_nowitk8q.pdfIn PDF document text
    • http://puwufonizezez.22web.org/hindu_calendar_2020_november.pdfIn PDF document text
    • http://profapp.pro/the_crucible_act_3_critical_reading_questions_and_answersf31wt.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/KhjhMhj/gulegekakojuroz.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/chargesheet_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/mjbDCrq/97579732948.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/06b1c2e9-e233-4c40-bfaa-20e88100c1ee/mutujatelogewikelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbff96f-58b1-4ab5-b70c-b2f4bac48583/how_much_is_sears_worth.pdfIn PDF document text
    • http://wawuzir.epizy.com/vatican_city_tour_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f4f949-9334-484a-914c-d4c12bab4be0/honda_maintenance_code_01.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3c2fae-6de5-4b43-a639-cf5faad5954a/hp_probook_4530s_i3_price_in_bangladesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f64231-b00d-4687-9777-c438bf0f26cc/2018_lexus_rx_350_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0937bf9e-df35-4c47-a4a2-d2fc187b7d1c/class_7_english_book_2020.pdfIn PDF document text
    • http://kuzotekekejepun.rf.gd/additional_mathematics_1_vtu_notes.pdfIn PDF document text
    • http://buguwotibiven.rf.gd/numbers_in_english_worksheets_1-_100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be41099b-703a-44cd-816c-f478064b10e7/wologed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd7e8e2-0192-487e-8165-961d9e9f1745/13471089563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07164fdd-80f7-48ad-aa73-c475700b935c/can_hdmi_2.0_do_120hz_at_1080p.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_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 5636 bytes
SHA-256: aaedfc1e5060d9781907efa83a3413313bed5915144fea77d3dde36932d2d015
font_01_sfnt_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 11268 bytes
SHA-256: 20aa63f0a90198a88a354b71020c91c828d92f1381e48f85fd5f943da122a84e

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