Malicious PDF — malware analysis report

Static analysis result for SHA-256 3684ebaf2f1c41a6…

MALICIOUS

PDF

83.9 KB Created: 2021-05-28 13:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 868ef433958f803fc00623d65aa50625 SHA-1: 2163f278fcad38a007e3421d8db70f7b5ca77540 SHA-256: 3684ebaf2f1c41a6f8b865e74113466602867a24d78c22b764d2b49a8c272bd5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The primary URL, 'https://fokemale.ru/strik?utm_term=arduino+uno+driver+mac', indicates a lure related to downloading drivers. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/strik?utm_term=arduino+uno+driver+mac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5fd254424a4cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_604831d1c0bfc.pdfIn PDF document text
    • https://sigojexubaj.weebly.com/uploads/1/3/2/6/132682800/f4bb6aa3b1d04b.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/zevap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fdbe1f0a3f98.pdfIn PDF document text
    • https://fusutazewemeben.weebly.com/uploads/1/3/5/9/135976358/6c07bc7ae8f79b.pdfIn PDF document text
    • https://pixogupegitof.weebly.com/uploads/1/3/4/5/134592450/rusive_jidaneku_kifuvisiseme.pdfIn PDF document text
    • https://memuwumobodedo.weebly.com/uploads/1/3/5/9/135974490/6520582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5ffd6ba75f485.pdfIn PDF document text
    • https://polopiwej.weebly.com/uploads/1/3/4/3/134353222/1457590.pdfIn PDF document text
    • https://peranuzepaz.weebly.com/uploads/1/3/4/4/134459051/8dca3dbefa9af72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470542/normal_6009a2896d7ea.pdfIn PDF document text
    • https://kosazuritejozu.weebly.com/uploads/1/3/0/8/130874521/1797235.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/f6e9fd42-3c2c-4d04-820b-b58483140488/gokuferolijafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6391aad6-94da-4d36-966b-df5405a341b9/xosejixabedole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c6df5d-2d0a-4210-bf16-b6f55e8f3bd5/do_it_yourself_breakfast_nook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6da733f-80bb-4251-8970-6a367efce5a4/zadobajeselid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db67882-12d2-435a-8fd9-ecfe36d31345/canon_eos_200d_lenses_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0277cde-f72c-4b75-ac91-3fc80b0742f6/33855128903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c8f8c1-2f75-4682-938a-b902f3d6ab84/94084702457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12fd3ef9-0c54-4a99-a514-3fae2208ee61/hansel_and_gretel_2002_full_movie_123movies_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b86eb9a-1f26-4549-9a22-a5fadc942cc4/17197925477.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 3116 bytes
SHA-256: d439d5ea1f26d3369f873fe292f6403e66ef9e61ef13a99f014e870d440695b1
font_01_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 4924 bytes
SHA-256: fc67fdc93a3acb4252ffc95f236883f22b437aaa5a4362670013056f3caa2258
font_02_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 11540 bytes
SHA-256: 3a74d743eda6de6abb92d349006b8418e6d1fe07cec19dcdd9dd2037568a9e8e