Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eea035671b51fe…

MALICIOUS

PDF

91.0 KB Created: 2021-04-02 15:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5dd16c78e7221f74de424ee863094c0e SHA-1: 5e82549619afd2cc6f3245f8b57e1baa06d83c6c SHA-256: 21eea035671b51fe60220fa3bdb4afe8496e1b7e363983860f33f2e1d526eaa1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://jacksth.ru/strik?utm_term=blank+map+of+the+world+in+1939, is directly embedded and likely serves as a lure or a redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://jacksth.ru/strik?utm_term=blank+map+of+the+world+in+1939 PDF link annotation
    • http://magnifioco.site/diccionario_tarahumara_espaoluxs15.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/xuzifirajina3i4cf.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/JjhLFF7/datigixekuvamuso.pdfIn PDF document text
    • http://salet.store/o_come_to_the_altar_lyrics_and_piano_chordsarpx1.pdfIn PDF document text
    • http://avtoshkola-region26.ru/powerpoint_templates_sample_powerpoint_presentation_for_job_interview_pptm2e6w.pdfIn PDF document text
    • http://alkostore.xyz/pioneer_mosfet_50wx4_aux_not_working9cpu9.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/je0jhhj/road_trip_snacks_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/d83S29U/piluzez.pdfIn PDF document text
    • https://cdn.sqhk.co/sanobude/g8bVYkV/xilisoft_video_converter_ultimate.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/jahgche/69895798341.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://s3.amazonaws.com/jipowumat/8818501251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500a90e4-e7b7-42d0-b053-3ece34fba7c2/tie_knot_meaning_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d722e2ca-3c41-41d9-8207-6713d421ec61/mingling_of_souls_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8474231f-15cb-4708-bd28-8eaa9eb75adb/14106131946.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_2ab1c77f00a74f2883689b5ee389fe85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df59d12f-2baf-49c3-a461-8c217d8df2cb/94178751150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71502f57-f73c-4945-8d8d-5b93af0ad566/what_is_a_bff_application.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_b26a76f9f5844148ad635ddea2c536c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e01a74-c42e-48f0-8cb0-fc8ac197ad3e/21021824401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ce09d6-ea7b-443a-9b91-f9c0b86df647/beyond_brawn_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebed8de-a55b-4bef-9de2-0b5eeabb679d/82259875190.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/how_many_calories_in_a_raspberry_jelly_filled_donut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26bd105f-1e53-4ebd-b84a-b91ddcb7025c/why_does_my_wahl_clipper_not_cut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd38cea9-06a4-450e-a0e1-3739d7ff9a76/cuanto_son_150_mililitros_en_onzas.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 5468 bytes
SHA-256: e779b46c94bb8e9f0228707803fb7cd5e14716f141e8463046e6d9deebaf5456
font_02_sfnt_off00012949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12949 11468 bytes
SHA-256: 782533d2d063dc3af56a8e76547bdaa3ee620d24568dc6d0af9b104e3fac5491
font_03_sfnt_off0001500a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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