Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bbc82e4fc062c1…

MALICIOUS

PDF

76.1 KB Created: 2021-03-01 13:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d86b3a459f9e071a89ad978f7d829228 SHA-1: f6a2b17667181c53a51e6b2b188d379da9665a15 SHA-256: 83bbc82e4fc062c136ca39270b56d5032eacce1a6dcf4f14a954ba3d9d26ea9a
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to potentially harmful websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://seumenha.ru/award?keyword=what+is+the+real+meaning+of+the+road+not+taken PDF link annotation
    • http://purpless.vip/genetics_from_genes_to_genomes_2nd_canadian_editionuxb0h.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/seagull_by_anton_chekhov5mr7s.pdfIn PDF document text
    • http://kindraretterath.com/elements_of_design_space_positive_and_negativejf3o5.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/dhfoicx/tanks_inc_floatless_sending_unit_wiring_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/gdgheib/bavusunukaza.pdfIn PDF document text
    • http://buytoday.cc/record_of_wortenia_warmaro7.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/z2cd8gf/81403202310.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/ijXhihe/mask_clip_ear_saver_diy.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/wexevim.pdfIn PDF document text
    • http://coloradocustomelectric.com/broverman_mathematics_of_investment_and_credit9uvyw.pdfIn PDF document text
    • http://ourfanz.com/88437266751lhd17.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/adding_and_subtracting_integers_worksheet_6th_grade.pdfIn PDF document text
    • http://pink-echo.club/boludunujedasutegupojinevrjv.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/ig5jf0s/diy_mask_pattern_free.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/epson_wf_2540_printer_error.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/JijjdRS/stop_folder_sync_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/coijhfg/fopuletagavezanibad.pdfIn PDF document text
    • http://tuimag.ru/mac_screen_recorder_with_audio_apptq31y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidikaxano.myartsonline.com/jizatisuvuzobukinobatov.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_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 5400 bytes
SHA-256: 94da4fe1ac02fd89e3b4d1489e377226848aa224ab184c4eb966339cc95f6a12
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 10152 bytes
SHA-256: d744fb1fe69a1e803d38dcf1a027c5a886750b7e1a0f16e09fe1ddbaa1d30d79

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