Malicious PDF — malware analysis report

Static analysis result for SHA-256 886ef9f8e3b98c86…

MALICIOUS

PDF

83.9 KB Created: 2021-05-14 17:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 15b9de7bc06a7409990520a076aedbaa SHA-1: 67ed0884f50aec156fc1078992322f5d35c25f32 SHA-256: 886ef9f8e3b98c8693f7b50bc10e7b8ddef12d1fc3c339ce19145af86d16d3a0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to hardware comparisons, directing users to external sites for further action, likely to download a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=focusrite+scarlett+18i20+1st+gen+vs+2nd+gen PDF link annotation
    • https://cdn.sqhk.co/loxexafetivu/jhihhat/kairobotica_1._0._9_mod_apk.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/xezezosujoxawitu.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/s3gcqig/roblox_download_unblocked_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/HQhaD5p/mixosone.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/vuposagapu.pdfIn PDF document text
    • https://cdn.sqhk.co/zitajazasu/ejfBGhb/kowiduzogawuravotekan.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/jgdggTD/extreme_car_driving_simulator_2_mod_apk.pdfIn PDF document text
    • http://zipotuja.iblogger.org/rock_climber_strength_training_program.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/6haDS90/54931476195.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/swIKjd6/chilis_gift_card_balance_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/bfjyxmA/2024356609.pdfIn PDF document text
    • http://tuwimig.scienceontheweb.net/brics_summit_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xunepesefosog.rf.gd/27617916383.pdfIn PDF document text
    • http://vedixerewe.epizy.com/99357914248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d0f314-6af1-40b6-8853-3af2e8ff43d9/pusamemuliliwivul.pdfIn PDF document text
    • http://gexepitirunagu.rf.gd/bertrand_russell_mysticism_and_logic.pdfIn PDF document text
    • http://jegowijuvu.epizy.com/sistem_bilangan_bulat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2597d3-e4ba-492b-8cea-194209430af4/jozoxajuwonoremexegozagu.pdfIn PDF document text
    • http://miviguwi.epizy.com/latest_ielts_academic_reading_practice_test_with_answers.pdfIn PDF document text
    • http://jotajatof.epizy.com/american_english_file_3_teacher_s_book.pdfIn PDF document text
    • http://digotadegijo.epizy.com/zetesofodufototumazet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f3b1ee-56c0-4594-8c96-db94a45e740d/how_to_fight_with_dual_swords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f589697-731e-4529-beec-3421e28a46b5/41306882278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8093fa4b-6c74-4412-a49f-b7f8d9658bdb/51057010180.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 5644 bytes
SHA-256: 82755a755cf735e63269ec7a2ab4aa2fe9b2e4f11e76d9fd1650e65df570f329
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 11340 bytes
SHA-256: 86628d935ce592de7f6a0af6a285c1fd0718e30c4cb1f784a80bc87036005e04
font_02_sfnt_off00012c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C81 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953