Malicious PDF — malware analysis report

Static analysis result for SHA-256 3949f05ce40ac143…

MALICIOUS

PDF

87.2 KB Created: 2021-06-04 05:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9fa52d92c79a7ca7ffe7513432c14765 SHA-1: b09d504fe0c208cc51f2f3a3019bfe32b2393b83 SHA-256: 3949f05ce40ac143106804639f10027f1a9381cc147cffceb55435d0c6c3e9a0
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 0.9951

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://pelibifir.ru/123?utm_term=alternance+maintenance+informatique+lille PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5fe712eed66cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_6066fcb407c9f.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/33efe3462410c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_605c6e8677dd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5fc6900099595.pdfIn PDF document text
    • https://tazusarativiwu.weebly.com/uploads/1/3/4/5/134510609/9d5f53b6cfd8ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482854/normal_5ff19aacc97ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_6035496f00b2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427538/normal_5ff56cea682c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_60214782c31ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5ff7fef1da835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_606248704ec03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_603294bb6fd0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5ff625b7a3278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375703/normal_5fcf0b4170152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_60310716f23dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_6056187200f98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jebodigezev.pbworks.com/f/linijubufuduv.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144413976/75834922639.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/how_to_make_a_dog_house_out_of_pallets.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144586860/how_to_unlink_rise_of_kingdoms_account.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/72699941916.pdfIn PDF document text
    • http://xibosini.pbworks.com/f/29087260225.pdfIn PDF document text
    • http://tosuvop.pbworks.com/w/file/fetch/144469122/jupudetiz.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/one_block_wonder_quilt_tutorial.pdfIn PDF document text
    • http://fudejob.pbworks.com/w/file/fetch/144504030/non_linear_demand_function_example.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/diseo_de_proyectos_en_la_investigacin_cualitativa_galeano_gratis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 4964 bytes
SHA-256: a13d23ac7edb7c9202016a87b86c852a2522e2a4292f788d086916e5868f71c4
font_01_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 12716 bytes
SHA-256: a898b163279e1761dff4a6275b61a309a511b816ca78dd9c4178c55392d300fa
font_02_sfnt_off00013869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13869 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d