Malicious PDF — malware analysis report

Static analysis result for SHA-256 9321a8c2030922ca…

MALICIOUS

PDF

97.2 KB Created: 2021-03-19 11:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3267c5b3218feffbc40d1da6d138ee98 SHA-1: b13aa82f3ada1327bc67df2fb41281e5260cf08f SHA-256: 9321a8c2030922cac0e7335801f0dc584334e9b79da555f655a4b2aaa832b580
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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, https://jacksth.ru/strik?utm_term=the+night+manager+season+2+air+date, is likely part of this scheme to drive traffic to malicious or spam content. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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=the+night+manager+season+2+air+date
    • https://webuwexuzebonal.weebly.com/uploads/1/3/0/7/130775053/2031746.pdf
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/7ea5941.pdf
    • http://f13x.xyz/how_to_find_log_4_using_log_tablekr7tg.pdf
    • http://diluzadumavotux.getenjoyment.net/centralismo_democratico.pdf
    • http://esclick.pro/42955568044z57at.pdf
    • http://vebilodugisugod.iblogger.org/30239376271.pdf
    • https://mevukufidax.weebly.com/uploads/1/3/1/3/131379039/vamax-tudelemojevib-xidunozubaliv.pdf
    • http://daparewipubuzes.22web.org/engineering_mechanics_statics_14th_edition_solutions.pdf
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/07c5dac3200b.pdf
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/d4c66d2ed90d47.pdf
    • https://gimogelego.weebly.com/uploads/1/3/4/6/134601730/4f6dfa2f.pdf
    • http://eduha.online/g-shock_mens_tough_solar_black_resin_sport_watchc04vk.pdf
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/lopalafek.pdf
    • https://piteselijofer.weebly.com/uploads/1/3/4/6/134608400/mirasamufum.pdf
    • http://pmaider.com/30892216310pd8kq.pdf
    • http://madoxorijegobe.sportsontheweb.net/78505708799.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://laropijodozu.epizy.com/34222764330.pdf
    • http://bedegexemizi.epizy.com/10892064188.pdf
    • https://uploads.strikinglycdn.com/files/bb8d6c07-537b-4ca0-a180-2d9101294997/swann_smart_security_system_3k_series_setup.pdf
    • http://bodirinukamole.onlinewebshop.net/english_b1_student_s_book.pdf
    • http://xufeguwopox.rf.gd/38590907922.pdf
    • https://uploads.strikinglycdn.com/files/4b8df6eb-3b91-4085-bc72-306bfa3c0c88/love_story_movie_song_1970.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001275b.bin
679d4d5752bc93ec582ab6165c3086eaa6415faddc050d55c2a1a852825c5ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 5288 bytes
font_01_sfnt_off00013929.bin
f7623bc55525cfed3d2ec950cb706cf90e9d7aa6ba23893bba68b2d7a09d2f97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13929 12288 bytes
font_02_sfnt_off000161f6.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161F6 16204 bytes

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