Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed6d17808ea1fc4…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 16:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be68f4e53c98d5995216d7a745085b13 SHA-1: 2d5d567490235d6e656c2c67bb743c46eaf4e386 SHA-256: 4ed6d17808ea1fc4d7be0b3c0ec7c07339b437dc403d778ee9517e003a442daf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a large number of external links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=was+jesus+christ+an+only+child
    • https://cdn.sqhk.co/detaludolef/ahdhche/5141303279.pdf
    • https://cdn.sqhk.co/fasixazijaz/iheCjag/halloween_party_themes_for_work.pdf
    • https://cdn-cms.f-static.net/uploads/4415530/normal_6017997a6c321.pdf
    • https://cdn-cms.f-static.net/uploads/4426814/normal_601f3f9557af4.pdf
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/644933.pdf
    • https://cdn.sqhk.co/vuritukupus/Bggjbhh/crash_bandicoot_gamecube_gameplay.pdf
    • https://cdn.sqhk.co/zawatilirip/hidKHjb/91067467718.pdf
    • https://cdn-cms.f-static.net/uploads/4406516/normal_60374aab0fc74.pdf
    • https://cdn-cms.f-static.net/uploads/4388407/normal_601d90d94e594.pdf
    • https://static.s123-cdn-static.com/uploads/4416666/normal_5ff9ab79154e7.pdf
    • https://cdn.sqhk.co/bomumuxa/djqQtC3/kafilu.pdf
    • https://lazoseroli.weebly.com/uploads/1/3/5/3/135316949/40e996fc5ae2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ronatiduzoxij/dokabosotejizawixud.pdf
    • https://s3.amazonaws.com/zevutebulaworel/jobose.pdf
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_072c1fadb3f8423d9137796c3b0a400a.pdf?index=true
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_fbc12db015a54f1e92aa4f88ef578023.pdf?index=true
    • https://s3.amazonaws.com/gitipelut/lessons_learned_template_agile.pdf
    • https://uploads.strikinglycdn.com/files/624e08d9-68a6-4280-9b5b-b323fa3a254f/how_to_tell_if_honeywell_zone_valve_is_bad.pdf
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_caf98678661f4090a1a8469ab8289cbf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/edd7b1cd-9c8e-401c-b5a6-3c90eb60f749/45306457347.pdf
    • https://s3.amazonaws.com/muvazi/follow_up_sheet_sample.pdf
    • 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_off0000fca2.bin
2b2d7051b1f23862ba48ac8dfcb27d107d42fb6b24cbd6ea5fb7b175b881e1aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 5216 bytes
font_01_sfnt_off00010e70.bin
c432ac24362ae2b291e0b67fa7af0af25951ddf4fd17238321376cd038184338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 10968 bytes

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