Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c840f6741c0c0c3…

MALICIOUS

PDF

67.1 KB Created: 2020-12-18 04:36:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f6b8b968b3c2a0a0aacb6627c9f99d74 SHA-1: ba700347644eb40c73f88b4c5b9724051bb59e24 SHA-256: 2c840f6741c0c0c3dc24cc399cb9a27cabb9d8ca981c6fbdab489dae1bc631f9
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a link farm designed to redirect users to malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though heavily obfuscated, contains fragments suggesting a lure related to popular media. The presence of embedded URLs and the ML classifier's high confidence score support the classification as malicious. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=alvin+and+the+chipmunks+theodore+girl In PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/xoris.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fce31d8ac778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f8f58365aaf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_5fae4c5e7084d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5fd6636cf1063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404105/normal_5fc76ee3dbce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f8b76cc802fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc066bd9955c744b5390948/t/5fcb5c3d9cf56e0e8b1032f8/1607162941326/vulizanikiguro.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ef8fc6229360ecad283f/t/5fc685c5173fb5383b86b33e/1606845893327/world_boxing_challenge_apk_mod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc552dee5c7695ca9b8dc4b/t/5fd736e35488895576c66e1c/1607939811534/android_tablet_browser_full_screen.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e0febe9b6939510aa6a3/t/5fc167054e98326c0244fbc7/1606510342622/xagoxovipanuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d73490a-fbf9-4c3f-b238-98efcd059803/maria_esa_mujer_letra.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19d720a2757459be7f0be/t/5fcf84b414319a51dc34c065/1607435462331/13156917782.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5908716f6d44b07de34e8/t/5fc68fc11972c46e3c83b59d/1606848458956/rugajuzofetunelafunoro.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50ec912facd59cec7ad64/t/5fd6290b102ca46975dbc4a1/1607870732374/desupore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8ea9e6-0d6e-41a4-9ec8-a14139b770ea/94876496471.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_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 5600 bytes
SHA-256: 90f8a440330d1c944fa797da4621362bf0b0eeabf71017012f21dee6853500a1
font_01_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 10260 bytes
SHA-256: 15ca0149022578ced3c59b666402b321ecb913ed1ffc38610940dcb3655bd4e9

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