Malicious PDF — malware analysis report

Static analysis result for SHA-256 187a88a04f3a65e5…

MALICIOUS

PDF

76.5 KB Created: 2021-03-20 08:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01c2d6258415ce76fa827566cc594fee SHA-1: 3a106bacf6566e4156c6a60556047a43eaab6e98 SHA-256: 187a88a04f3a65e5a65c4faf1265b3a9de6dc0ec7b89a6c254ab2eaf992fd6c3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to various potentially malicious sites. One prominent URL, 'https://xezojetit.ru/wix?keyword=clinical+nursing+assessment+skills+pocket+guide', is directly embedded and likely serves as the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=clinical+nursing+assessment+skills+pocket+guide
    • http://zaxobus.iblogger.org/gejiragiwuvedonulad.pdf
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/luposojurotaga.pdf
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/kanuruporeren.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://masasor.rf.gd/how_to_fix_a_leaking_vitamix.pdf
    • https://uploads.strikinglycdn.com/files/1acc4e49-3035-467a-8d6b-02ec08d883eb/meaning_of_the_phrase_wham_bam_thank_you_maam.pdf
    • https://uploads.strikinglycdn.com/files/087463da-9fac-4697-80af-dda06fd2e2fd/gatudoroworuxarokoru.pdf
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_dfd99ab99fa84d378453b00c3866c2ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a28ea85c-e129-40f1-b33f-072b6867a775/woniv.pdf
    • https://uploads.strikinglycdn.com/files/9f6b8032-a1f7-45eb-805a-6fa6cbd441af/can_i_watch_hbo_max_on_apple_tv_app.pdf
    • http://fimageparoxa.rf.gd/99035891422.pdf
    • https://uploads.strikinglycdn.com/files/41cf32f1-bdd8-4691-aeb9-6cbfc73540a3/wonder_weeks_leap_4_mumsnet.pdf
    • https://uploads.strikinglycdn.com/files/8b14c6cc-0c03-406b-97e7-bcb812332316/how_many_questions_in_frm_level_1.pdf
    • https://uploads.strikinglycdn.com/files/f899abd2-e56c-40d5-bd36-5e311db9354a/81946530666.pdf
    • https://uploads.strikinglycdn.com/files/2fa07416-6000-4102-996a-b077be99c141/bless_me_ultima_summary_chapter_21.pdf
    • http://poketiwuk.rf.gd/bejaia_tourisme.pdf
    • https://uploads.strikinglycdn.com/files/56fdff31-f3fa-4f39-b07d-5c4f36884ef1/derechos_humanos_universales_in_english.pdf
    • https://uploads.strikinglycdn.com/files/43d401c6-4308-4683-9fea-05df0dac137f/36565329340.pdf
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_a4a7b8e573f94a1d817a9b906259f028.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2639a780-40e5-4b94-b8f5-a1947c782d0e/explain_the_tools_used_in_project_management_and_their_purpose.pdf
    • https://uploads.strikinglycdn.com/files/a186a58b-6f4b-411f-b88d-88ee3cadc48a/60729698591.pdf
    • https://uploads.strikinglycdn.com/files/d30d3842-316e-4c22-baf4-ff511bcf3331/english_grammar_test.pdf
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_35dbc3661373460780fc263c36112570.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efec.bin
8a9f21b02977502dbaab9c89c645dc8b41450dcf880d16ba609f26695fb1f216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 5360 bytes
font_01_sfnt_off0001020d.bin
b2dc02cc5a10422f610b427257e37e78a2629239b81da1afc289c4b1fc0895c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 9924 bytes

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