Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7b589297686df1…

MALICIOUS

PDF

77.5 KB Created: 2021-05-11 20:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0556cdade70a4822ac3362faa2139668 SHA-1: 23326fbf7bc6b1c377395d23d3628abd7e31a2fe SHA-256: 5c7b589297686df1773f1ce7ecbd444bf9b7e06915f8c899d348ca74df016c6a
284 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to suspicious or known malicious domains, indicating a link farm designed to lure users to potentially harmful sites. Heuristics like 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://dafemum.ru/strik?utm_term=who+does+rainsford+kill+in+the+most+dangerous+game In PDF document text
    • http://iwhite.space/93829630475sd04a.pdfIn PDF document text
    • http://vzroslyh.net/bewarasojupiwidelozutu7ecgw.pdfIn PDF document text
    • http://sevexuv.22web.org/14115684758.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/bozutafosi.pdfIn PDF document text
    • http://zopevaxawoxe.22web.org/how_to_magnetize_an_electric_generator_field.pdfIn PDF document text
    • http://organicnu.info/bifegusus0c54q.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/girar_pantalla_android_9uebw9.pdfIn PDF document text
    • https://poxotedodesogin.weebly.com/uploads/1/3/4/3/134305686/dc8fa55dd0.pdfIn PDF document text
    • http://marketeuro.pro/masterbuilt_electric_smoker_low_tempix74w.pdfIn PDF document text
    • http://jakebaxujimug.22web.org/judunojesuw.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/guzaduromonijagive.pdfIn PDF document text
    • https://buzowoxeferoxo.weebly.com/uploads/1/3/4/6/134662453/d09eeec2.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/juxusexanebap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_90002f07713442ad9bb0b70bf5a2086f.pdf?index=trueIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_7189a70b644547c6b8a0b9edcf6caec2.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_5cc2558e31dc4697bc084b7f5205bf03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33aae0b5-11eb-418f-8ae4-77943d889631/what_does_taciturn_mean_in_to_kill_a_mockingbird.pdfIn PDF document text
    • http://xezigogologivam.rf.gd/rubebatajexonatave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08249a22-ff58-42fb-aa27-5d9ebcdf298f/mozenajodafuvubavugujize.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_4626bf5c5ac54187b0c9d540231338e1.pdf?index=trueIn PDF document text
    • http://vupafigimewex.rf.gd/bodoland_lottery_result_download.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_30cb14f552f04b6c8e593a37d89100bb.pdf?index=trueIn PDF document text
    • http://koluriv.rf.gd/durban_poison_indoor_grow_report.pdfIn PDF document text
    • http://kazoverowagodi.epizy.com/the_brink_movie_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29acb9c2-7781-489a-a5b1-e13e9f39e458/why_does_my_dish_keep_say_no_signal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46a2a6c-f72f-4da5-8a96-df0e45018986/how_to_do_drift_zones_forza_horizon_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8c891d-b551-4ba6-a009-f33bd713bad3/39865575288.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/77456481104.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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 5400 bytes
SHA-256: c335c3b639e41491310d73e02d7833250c7eb9222af10b36b320a2a8113a3c8e
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 10112 bytes
SHA-256: dcd0544f212d8c0299db39a86ae24c2a2af24aa50f6d6d2af2bb73cb5fadb4b9

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