Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd5174b5442cf52…

MALICIOUS

PDF

81.7 KB Created: 2021-03-23 07:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 263ced8a6dc8ce9f4f6246ef8c97cb0b SHA-1: 40a77e8f261acaf2a55ce25688de17c16c58038a SHA-256: 0cd5174b5442cf521e63ec28c39d8f828e812531eabfd3e59083423eb5966013
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary embedded URL, 'https://xezojetit.ru/strik?utm_term=epic+emr+system+cost', indicates a lure related to 'Epic emr system cost'. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristic suggest it's designed to drive traffic to malicious or spam sites, potentially as a precursor to further infection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://xezojetit.ru/strik?utm_term=epic+emr+system+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374013/normal_6020394661096.pdfIn PDF document text
    • https://kazawiluk.weebly.com/uploads/1/3/5/3/135384823/kinoxilemo.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/933905.pdfIn PDF document text
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/puwolos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_60135adcd7656.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/what_is_analysis_and_design_in_civil_engineering.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/aplastic_anemia_treatment_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_60370ece0c69a.pdfIn PDF document text
    • https://budorezaru.weebly.com/uploads/1/3/4/8/134859022/sisujuko_fodamawig_xazedimukem.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/55124141773.pdfIn PDF document text
    • https://rikinosi.weebly.com/uploads/1/3/4/3/134352476/38b352ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_60194f2025ee1.pdfIn PDF document text
    • http://linefofaxugedu.mywebcommunity.org/smd_capacitor_datasheet.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/temivixobokupilobazab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5ff59c5926863.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/2045029.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/henry_van_dyke_quotes_dying.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merovuditipin.onlinewebshop.net/54762511295.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_0bda8675d0ad4c69ab969308a6b20233.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_8184026a814e489da2ec91993b70ea1b.pdf?index=trueIn PDF document text
    • http://penanaras.myartsonline.com/susoxazutu.pdfIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_37bae5e56a3f41adad2ecdf5ed5e42f5.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_bb58aca411fb49708cf4bd2376e2dd12.pdf?index=trueIn PDF document text
    • http://benamow.myartsonline.com/autocad_2020_official_website.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_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 4896 bytes
SHA-256: c8ebda3758934244b5824200aabb45d9844a67d1a36db1bd0395066499887897
font_01_sfnt_off0001138b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 11188 bytes
SHA-256: fb6d9d8c66d5289b98da6df61f5e9902795809e4fe82fd47b58f5d42e13a52bf