Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c30ad6724176ec…

MALICIOUS

PDF

85.7 KB Created: 2021-04-07 22:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a6543e2baac6be4394a07cfda268538 SHA-1: 9a6f8fc3a6c0f20270ca58e76b7597ad1460f583 SHA-256: 25c30ad6724176ec3853a5f901717022eeaca2540f85d6866fde0bffc40a16a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The embedded URLs and the PDF structure indicate an attempt to direct users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://druttle.ru/strik?utm_term=why+won%2527t+my+oven+light
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/bagitemo-nofatenama-tadisanojesites-wawuraxuvep.pdf
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fe69a45c1289.pdf
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/1874073.pdf
    • https://static.s123-cdn-static.com/uploads/4479904/normal_600299ab34d76.pdf
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5ffea54295f05.pdf
    • https://wirimodarezekas.weebly.com/uploads/1/3/5/3/135314182/1227841.pdf
    • https://losikopak.weebly.com/uploads/1/3/4/6/134616488/zisusesosubal.pdf
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/3b1d1ac3.pdf
    • https://cdn-cms.f-static.net/uploads/4488807/normal_601b57aae3e6a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d15dcea0-06d2-4af8-8a89-c436ae4f238f/sagifojimafuvasokisiz.pdf
    • https://uploads.strikinglycdn.com/files/c6a06e85-3b21-49a2-b32a-23dab12fc3a5/jeppesen_private_pilot_test_guide_download.pdf
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_400a9c8c9d6048e69ef6c44efc7dd8b2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2817a728-ae38-4da4-af20-ebe942e246b8/is_wordpress_easy_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/43a4afae-66c6-4548-b813-a200d9f83c2a/romeo_juliet_songs_download_starmusiq.pdf
    • https://uploads.strikinglycdn.com/files/b454aed9-99f6-4215-ad98-95f01d0c36ad/suxusojivebi.pdf
    • https://uploads.strikinglycdn.com/files/a8992407-ab92-4f7d-a1a8-94fab52348e1/39794964970.pdf
    • https://s3.amazonaws.com/zisulamisozoto/google_docs_import_excel_spreadsheet.pdf
    • https://s3.amazonaws.com/zerepuzuze/48147374755.pdf
    • https://uploads.strikinglycdn.com/files/cec10721-be35-48a3-bec2-3539e6c150ef/star_wars_heroes_mod_guide.pdf
    • https://uploads.strikinglycdn.com/files/0e47860c-dcd2-42f5-abf2-0b37fb37c53c/walther_pk380_field_strip_key.pdf
    • https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_98beb3fc2b3d4541815993b7d0b224cf.pdf?index=true
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_81e6ab242b394e389b4ca4a4bfa2703f.pdf?index=true
    • https://s3.amazonaws.com/metubevozisul/fegemarugemewujuzatiki.pdf
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_f5e4c1485e8247308a514f5a49b98229.pdf?index=true
    • https://s3.amazonaws.com/xuvamuba/inventory_template_printable.pdf
    • https://2df7536a-ab64-4dd3-a6ca-98e0eca144a4.filesusr.com/ugd/de578f_6c23837be8fc4366ae52cf56116725ff.pdf?index=true
    • https://s3.amazonaws.com/piwanisaj/joseph_prince_communion_sermon.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_off0001132b.bin
3590b4a886aa31ab19851fce9e8e9709636f0c94dde653e95002de31f7b48ef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 4916 bytes
font_01_sfnt_off000123ef.bin
de69946b966a8d19a1d305b06b94699764d741f8481cbfeb1bf350d27d3ea659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 10772 bytes

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