Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd86c39b572b24c…

MALICIOUS

PDF

85.6 KB Created: 2021-03-14 19:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9b2cb94937e8091274e242ff64753732 SHA-1: dde981c33f533b8ef5cacce151ac5a888eead147 SHA-256: dcd86c39b572b24c7e9d84bbc59112b66fb6d9db31df16846a00a3b479b623ed
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://botokaw.ru/123?utm_term=single+cordless+phone+without+answering+machine PDF link annotation
    • https://cdn.sqhk.co/najiligopej/iiZgcge/easy_piano_chords_sheet_music.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/who_are_famous_magicians.pdfIn PDF document text
    • http://kungfumalibu.com/jagumagmmjcp.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/zdithfr/globe_prepaid_card_failure.pdfIn PDF document text
    • https://cdn.sqhk.co/vonofuguniti/ZMjd2hb/61222632695.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/steve_harvey_jump_free_downloadthx40.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/husky_2200_psi_pressure_washer_q45_series.pdfIn PDF document text
    • http://korixoludofuguk.scienceontheweb.net/libro_el_bogotazo_memorias_del_olvido.pdfIn PDF document text
    • http://winoorama.fun/husqvarna_455_rancher_top_end_rebuild_kitcv1tw.pdfIn PDF document text
    • http://trastqort.online/zafopozesojory71fp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_5ded9e691c0e45ee8bb5f28494207eb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/how_to_type_up_a_rental_agreement.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_8442e2db18354206b906eb254b17285f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/neguxipewami.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/muruferijibuvizo.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_f364157ab8964e458e0258d87d4c1117.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_74f53f54e60646dc8ae3fd167161c2a2.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_3ee86de8393f4e7c8911d243f5ecc0b0.pdf?index=trueIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_40884388898c4cef8c0bf5214e534b8a.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_d225bdeb277d41bbb938cde7daa2038e.pdf?index=trueIn PDF document text
    • http://jujageritoxo.atwebpages.com/the_bastard_of_istanbul_read_online.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_a33074f748e348d39038667082d8f7bf.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_e5f6485222ab413d83614e23eae8fbc1.pdf?index=trueIn 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_off00010e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 5680 bytes
SHA-256: 7396959d061ede6cb9feb4b19347dec5819c90d451dc8a70d33a8b167598dd89
font_01_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 11556 bytes
SHA-256: b5a5011cd11d31b873382c0eddfd763a46c5b96c11ca64608885babb0c55e113