Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb23dd7f0aca2789…

MALICIOUS

PDF

72.7 KB Created: 2021-06-03 18:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e3119ef617d27b0b84b0bb522192a767 SHA-1: 11036a308057dd5987ed0ec3529d0f4ae6d8b54a SHA-256: fb23dd7f0aca27895c6205b6338195505a6a6a99c1b85dcd0e3b4ee4e2833353
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-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.
  • 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://nomylo.ru/pbw?utm_term=codex+adeptus+mechanicus+v8+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378406/normal_5fcf4c0b88e7d.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/9864249.pdfIn PDF document text
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/febugopimimeviz_sipufexut_pofoxo_ropuvuwifalode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380854/normal_5ffce01554b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_5fdbfbca30459.pdfIn PDF document text
    • https://xibuderopugef.weebly.com/uploads/1/3/4/0/134042602/zafutij-retuworexutas-kudunam-jadunin.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/325ffc1.pdfIn PDF document text
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/ketilizunuwoxab-pesewax-zezobonijorax-benadavetaz.pdfIn PDF document text
    • https://fitovaturi.weebly.com/uploads/1/3/4/3/134371738/jorigewokowepozevepi.pdfIn PDF document text
    • https://xepekozodixati.weebly.com/uploads/1/3/5/3/135346226/00c6240d6d76.pdfIn PDF document text
    • https://fijirozarejum.weebly.com/uploads/1/3/4/5/134599913/832644.pdfIn PDF document text
    • https://boziwigezuzes.weebly.com/uploads/1/3/5/9/135984517/garinutow_noraju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aaf864c-1a0b-44cf-b29e-fa8c45b74885/twilight_saga_new_moon_free_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/120b035b-e432-4eaa-8d45-add076eb0e1d/how_do_you_drain_a_kenmore_front_load_washer.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/dufokusuwojuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7543b2cf-41e8-421e-bac3-9d4ff2e8528e/varokomuxarerig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4efd44cc-45d7-4131-ac9a-560f46956884/my_passport_wireless_ssd_user_manual.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/w/file/fetch/144478146/how_to_speak_english_fluently_and_confidently_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1e3c9c-cec9-4cde-a127-984df85fb76f/how_to_make_a_toddler_cape_with_hood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8f679a-ddc6-4295-b138-6d0834237e44/is_bioshock_remastered_better_than_the_original.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 5620 bytes
SHA-256: 887e40dec55f44daac72e0e489b03648cc6680872a9be4c1b9e91d2138c7ef2d
font_01_sfnt_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 10708 bytes
SHA-256: 057630affbd97cb74720823184f437cc7bf1088515e69fca5d47a727b3cb0dc7