Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2fb00739508494…

MALICIOUS

PDF

78.0 KB Created: 2021-03-10 10:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a8e0bf6b151a7c784304e2b2839fb59c SHA-1: db8cf944fa33495e1b04311ce1f99bfed496026c SHA-256: cd2fb0073950849454dacd8965fd16dbe64bf8654289d84c3a4cee398ec1f277
186 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. 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=castle+clash+mod+apk+1.+3+4 PDF link annotation
    • http://nuzanav.22web.org/navy_boot_camp_in_illinois_address.pdfIn PDF document text
    • https://cdn.sqhk.co/voxobidivel/Khajap6/harlem_globetrotters_best_basketball_team.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/ejiCzif/ben_10_alien_swarm_ben_tennyson.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/igihjcK/bee_gees_too_much_heaven_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_5cc5cd8801a843358cb593b961499421.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_958633509c3b444a88d9dba511391700.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_76cb4a5e7c7747e0805e72a375f29f78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f38e477-52f8-4cb9-9fd7-daa65d2f4918/ruburade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3193ca5-0b02-4606-a034-7acfb7cce714/luxaduxogulimiwotezux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42cae72d-e32d-4bd4-9fa5-12bdb47519ba/48044827604.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_c667cdea220142b396238e076a5f9dc1.pdf?index=trueIn PDF document text
    • http://lozomemogu.rf.gd/jogutejininamenenuwib.pdfIn PDF document text
    • http://babematalal.epizy.com/unstoppable_god_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1f5bb5-c276-4acc-80f4-8a52b3e0512c/what_is_the_purpose_of_structured_query_language.pdfIn PDF document text
    • http://fopalemominito.epizy.com/history_of_china_podcast_soundcloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da726caa-fd99-49e6-a587-6c41f6baeaf5/lamuduxutidupenabigutuz.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_306859d141ab4c978126116758ce65ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b99b02a-7be7-4a7c-974d-b113f5409440/26713319935.pdfIn PDF document text
    • http://pemukusa.epizy.com/sidiviva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab12e63-6dee-45f9-9723-52f4441ed00f/66556245046.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 5272 bytes
SHA-256: a269ecb1e4785c647734fb735c7be5422b47b8644fcb410427ffa08151ded968
font_01_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 10708 bytes
SHA-256: 0c7289540c6d012b8af33aaff60b989ff885dbe192aa97148a2a24c97c448f48
font_02_sfnt_off00011cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333