Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfd39dc06558d88…

MALICIOUS

PDF

87.2 KB Created: 2021-04-06 04:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8be60b4433e914b6942ee9ecdda2fbec SHA-1: 718358ecbbded2661cc6e8c015e11750d500d7cb SHA-256: 1bfd39dc06558d884fcd16c3d71a311321dde0572ae76c03a3404195deca63d1
126 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with a primary suspicious URL being https://mezovuduw.ru/strik?utm_term=saxon+math+student+edition+grade+4+answer+key, which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/strik?utm_term=saxon+math+student+edition+grade+4+answer+key PDF link annotation
    • http://narawodosure.medianewsonline.com/lezokomeru.pdfIn PDF document text
    • http://iranianvc.com/whip_it_rc_raceway_and_hobbieskjtjd.pdfIn PDF document text
    • https://cdn.sqhk.co/sepolulegaba/iegcpPY/tezelitipakanemozetula.pdfIn PDF document text
    • http://shop-you.xyz/drumstick_ice_cream_cone_tipskdqjf.pdfIn PDF document text
    • http://palawawez.mypressonline.com/pemeriksaan_ankle_brachial_index_adalah.pdfIn PDF document text
    • http://leoidet.xyz/what_are_primary_and_secondary_standardfhi73.pdfIn PDF document text
    • http://shoppingyxplus.xyz/photo_collage_creator_downloadz2yrk.pdfIn PDF document text
    • http://optalpha.com/math_worksheetsinnz3.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/ibCLidf/true_football_3_mod_apk_liga_indonesia.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/mechanism_of_acquired_immunity.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/antrag_schwerbehindertenausweis_nrw.pdfIn PDF document text
    • http://azules.ru/how_to_use_the_cuisinart_ice_cream_machineg0f6d.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/b_d_chaurasia_book_download.pdfIn PDF document text
    • http://spencermcman.us/91273166912927xk.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/bmqhgsN/dead_ahead_zombie_warfare_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/igDgdhd/hq_raid_atb_thief.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0cfea213-05c2-4851-b059-8d8526b03214/craftsman_125_psi_1_hp_3_gallon_air_compressor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5c3014-d025-4089-b71f-8aaab5496a52/naviniwojosokawikolixub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7dff04-dbe9-4a7f-8113-faefaac971c1/rosojuvekojofitulux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54bb67d7-cc4b-4fda-b463-f71c9f61a342/ruvazutovesow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0da88d-e59f-4dfb-bf9b-389e52fae943/significance_of_othellos_last_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96146fbb-f5b2-49f4-88b0-c9f83405471e/povajisijaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf2cce2-a760-46ee-9518-b9e4ad2a0fd5/conventions_of_drama_examples.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 5604 bytes
SHA-256: 0df631518642646a4e48c3bc78255f650bb1b24b3fd9e221f29865cb1ca4c200
font_01_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 10540 bytes
SHA-256: f1f51293f57151a4cac506abd54653f52602a13648528a60b555861afdfb66a9
font_02_sfnt_off000140aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c