Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f38e3cbc8479cc…

MALICIOUS

PDF

75.4 KB Created: 2021-03-19 04:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1dbe62c2ee00c684cc4bffed285b4c1 SHA-1: 7872c5eb7a93bd5396f9fb89f2828f8a49f69ba4 SHA-256: a9f38e3cbc8479cca2c35070cfa266117219fd65bbf437045d7cb2daee53e6d3
126 Risk Score

Malware Insights

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

This PDF document contains multiple external links, with a primary URL pointing to a suspicious domain that appears to be part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://soxebez.ru/strik?utm_term=formato+para+elaborar+una+minuta+de+trabajo
    • https://cdn.sqhk.co/sujubowip/Cgjijgd/7112622177.pdf
    • http://limaxinsto.xyz/nalodefapaxubl438.pdf
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5fe3a186d8e02.pdf
    • https://static.s123-cdn-static.com/uploads/4383923/normal_5fdd45a5053ea.pdf
    • http://azorocheat6.xyz/where_are_unity_assets_downloaded_toehg5a.pdf
    • http://sendgrid-de.com/9431158814bg6x.pdf
    • https://cdn.sqhk.co/xurajalijok/Pbbihgb/14735416101.pdf
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5ffb7bb000aa4.pdf
    • http://mabay.fun/amarnath_yatra_doctor_list_2018f5orl.pdf
    • http://openplafond.xyz/how_to_remove_directions_hair_dyeqkmad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9ae31c18-151b-4de0-8e04-a83c686a9b32/fopijabe.pdf
    • https://uploads.strikinglycdn.com/files/c011fe43-747c-4b7b-b771-8b01d24961b4/24676997781.pdf
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_b2122f12ec5e419cbbe4db496e97dcd0.pdf?index=true
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_c7c5883205bf481b8bd9382c7b91e8c4.pdf?index=true
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_22a1fb42cc2542f4b91388a8d337cd10.pdf?index=true
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_a3bf31f3acaa4ed3b32047ae730658d2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5cc99ab4-f116-4594-a180-701c308697c6/how_do_you_do_step_2_in_aa.pdf
    • https://uploads.strikinglycdn.com/files/8d155bd4-91fa-46dc-96c4-00babbb53931/do_nucleotides_contain_nitrogen.pdf
    • https://uploads.strikinglycdn.com/files/6e550a4f-96a9-4058-8998-508d671e49ed/are_florida_pythons_dangerous.pdf
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_7fccc135a9214b37bd5b04c107c10b70.pdf?index=true
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_7aea9250bfc34092bd40d05fd003bb0a.pdf?index=true
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_a2ddc31639e946bf86665627af653e57.pdf?index=true
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_424fc0e3e28d4a78b7881de55285be10.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e737.bin
301b1847eb7d7042e39ec35f481e226c01bfcd14909b2ddab92bc8cd44b07ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 5100 bytes
font_01_sfnt_off0000f86e.bin
9f7a26e1e6833beb46338b3c360de60bed9bd0ae8367301fe63923cca9b36de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 11616 bytes

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