Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bfc16b7dbbf3cf…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 19:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f1c150a52c11db2b2620d5649832160 SHA-1: 624c6976d46a0b788b2cc1b0c51cd77ce262f696 SHA-256: 84bfc16b7dbbf3cfdcd585006b82778d27221a06eebaa0dd17a79fc8d0521e7c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO abuse tactic. One of the primary external links points to a URL that is likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/wix?keyword=printable+iowa+driver%2527s+manual
    • https://static.s123-cdn-static.com/uploads/4457332/normal_60021ec2a715e.pdf
    • https://moxetutatag.weebly.com/uploads/1/3/4/2/134234950/50da4882a391c33.pdf
    • http://crysety.xyz/96469745314w6v5w.pdf
    • https://soranetibipuve.weebly.com/uploads/1/3/0/7/130738631/munevizolegu.pdf
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/4dda20f.pdf
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5fee9fa71b47c.pdf
    • https://wuruderow.weebly.com/uploads/1/3/5/3/135389815/4df04e7264fc56.pdf
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/safabafixug.pdf
    • https://cdn-cms.f-static.net/uploads/4446789/normal_60210fa1c3de6.pdf
    • http://fruit-ital.space/toefl_ibt_barrons_book_free_downloadksqr5.pdf
    • https://cdn-cms.f-static.net/uploads/4384482/normal_600e80c753a0b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/82325c67-0c1e-4010-82ba-e246e2831ea6/because_of_mr_terupt_books_in_order.pdf
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_4fa78f13405d4f5db73cccd60d7422bc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3ab68258-2b94-4d2e-baaf-3428e4d26e7e/how_to_study_and_pass_nclex_rn_after_failing.pdf
    • https://uploads.strikinglycdn.com/files/2117e81f-7549-4a69-b63a-457a46383bba/genie_h6000-07_owners_manual.pdf
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_71a2ebaf097c4780bfaf4eaeb30177c9.pdf?index=true
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_042b9da4121c499ab7c0f82bf6f94d86.pdf?index=true
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_173c6924506a43a1b5b4ad1f37aed39a.pdf?index=true
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_e2c1cc212ca14a32b84be3b4a991aa5b.pdf?index=true
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_d223a87febc347a6af563c1c1d04f709.pdf?index=true
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_9450f1e4c40f488f879ad3a299dc6d3a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/da70f8b1-dcd1-4c41-a83d-b622d2adc2c9/93194677078.pdf
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_29bc91887a654cefadb45b6c8e433458.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7bc2d467-a0a6-4d80-8fb4-3d1975e26e33/ap_psychology_review_sheet.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_off0000f7a0.bin
eb57d30099f398f821ad51c03caf0d0c21260d71c2d26d59f2d9359bfe6becd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 5300 bytes
font_01_sfnt_off0001099f.bin
0370a0d8e4e02cc0df8e72d8c9c1be1a407fc6960c4341c95109fc51370f678b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 10720 bytes

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