Malicious PDF — malware analysis report

Static analysis result for SHA-256 35da8e370dc4872e…

MALICIOUS

PDF

85.9 KB Created: 2021-05-14 06:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ba6a8ad9d0cf9df27787ceb37a4c09b0 SHA-1: 8bac9095fa4ba91d42e09ce9502a24ccd53504b0 SHA-256: 35da8e370dc4872ec70ab8a3214b7f40a911e95478b23bc397a1c095aa73f0d9
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=what+is+dialectical+behaviour+therapy+used+for PDF link annotation
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/mesalarigilubu.pdfIn PDF document text
    • http://sunny-web.ru/5648887042257fle.pdfIn PDF document text
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/7263201.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/2_g_ml_to_lb_l.pdfIn PDF document text
    • https://rejaduwewuwuga.weebly.com/uploads/1/3/1/8/131856140/2a59036692285.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/ab6df3f7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_601dcaf03260a.pdfIn PDF document text
    • https://kovozewiridudu.weebly.com/uploads/1/3/0/7/130738567/8622485.pdfIn PDF document text
    • https://nafejodibema.weebly.com/uploads/1/3/4/3/134318188/dofaveserelom.pdfIn PDF document text
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/6c4542169.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/7ab47c1ca.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/jegeribanarunusozunuj.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/pumuwezojazoz-xavawufez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_6018450cd25a5.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/5bb7e6fa432e7b1.pdfIn PDF document text
    • http://umkatrade.ru/kaxuwirofesejipa4egev.pdfIn PDF document text
    • http://wexypay.icu/how_do_i_get_my_nespresso_vertuoline_out_of_descaling_mode7je3j.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/vumavolipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382639/normal_604d047e56a9b.pdfIn PDF document text
    • https://sivesasa.weebly.com/uploads/1/3/4/6/134669324/8f0f48f46d44.pdfIn PDF document text
    • http://flowerport.shop/how_to_charge_an_ipod_shuffle_without_a_charger97cxb.pdfIn PDF document text
    • http://openchambre.xyz/onan_7500_diesel_generator_service_manual5j72q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472188/normal_6031545e90d3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 5336 bytes
SHA-256: 09d14a19d53ea96767474ca76c51b826edbdd86f7ab0eeb1d0596754ad7e632b
font_01_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 11884 bytes
SHA-256: 962c28296a3edbe53d70df80673357b001bf30bd5b07285605884c96d6cc0c5c
font_02_sfnt_off00013b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B92 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230