Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f93a4a0645f1f24…

MALICIOUS

PDF

82.5 KB Created: 2021-03-28 06:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0c05dc5f5df730fc216969b2fde702f9 SHA-1: 22623de3bb9f6e063715744e50ae1c2c15d1ac31 SHA-256: 4f93a4a0645f1f24543a9747c69afb7a159496aa9f2f089c08b31b3a0822727e
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 services, suggesting it functions as a link farm. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary purpose is to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=bob+rotella+golf+is+not+a+game+of+perfect+quotes PDF link annotation
    • https://sosufafa.weebly.com/uploads/1/3/4/8/134862430/2292538.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/GRShijd/oceanhorn_2_apple_arcade_review.pdfIn PDF document text
    • http://changepass.online/how_do_i_clean_my_bissell_proheat_pet_carpet_cleanertl94w.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/gf3vGY6/16802657003.pdfIn PDF document text
    • http://meriline.store/hairy_fred_song_lyrics2wi47.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/b4e6020dd0863.pdfIn PDF document text
    • https://molowusutet.weebly.com/uploads/1/3/1/3/131380828/fopoz.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/2028658.pdfIn PDF document text
    • http://azorocheat6.xyz/33975775846lqqyv.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/jDPTTji/war_strategy_games_pc_old.pdfIn PDF document text
    • http://cozyplacefor.rest/homonyms_worksheets_2nd_gradeeayok.pdfIn PDF document text
    • http://vomufitil.iblogger.org/allergen_information_starbucks.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/a263e2ed.pdfIn PDF document text
    • http://afracheat3.xyz/frigidaire_gallery_refrigerator_remove_ice_maker19oy3.pdfIn PDF document text
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/nibisozerigu_pekudakejaviw_guzuxona_vaboru.pdfIn PDF document text
    • http://demask.space/ginewowozewab4va0.pdfIn PDF document text
    • http://medicalpracticementor.com/32389596548c2z1n.pdfIn PDF document text
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/3428443.pdfIn PDF document text
    • http://blognews.top/36692698304167ae.pdfIn PDF document text
    • http://jasapremium.xyz/rudilatadegepupi5d7qf.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/22181bec333f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonituzesubilit.epizy.com/loraraxilakulideligivuw.pdfIn PDF document text
    • http://gamukudolaxe.epizy.com/cds_1_2020_result.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_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 5648 bytes
SHA-256: c51f8299bba9d72d2752b80ab530d2377a538becb8923328d68949753016cc42
font_01_sfnt_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 10996 bytes
SHA-256: 1cf77a9279d6c9c0e50bbf1aabd877e44fc4dbf8522d0e3c49e3d2ebac0dd444

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