Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe8644663a21293…

MALICIOUS

PDF

68.8 KB Created: 2021-06-08 23:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: db7231358eed192054d4251be3eec109 SHA-1: 1e5ee3768f0df8d99c6c2dc445279180151277df SHA-256: cfe8644663a212933a01d9f407c17b37febb089eb26395c0d040f40275bec2f1
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 0.9998

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://zajinet.ru/123?utm_term=alta+performance+fabric PDF link annotation
    • https://bovuvodesibos.weebly.com/uploads/1/3/4/3/134377535/pelup_miwebuv_lazuferimibunak.pdfIn PDF document text
    • https://jopegivev.weebly.com/uploads/1/3/4/2/134234712/suvasimojeravugad.pdfIn PDF document text
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/2281469.pdfIn PDF document text
    • https://povoligijiz.weebly.com/uploads/1/3/4/6/134665243/989496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_5fc5f184084e9.pdfIn PDF document text
    • https://lagepelod.weebly.com/uploads/1/3/4/7/134716456/8238280.pdfIn PDF document text
    • https://potuvomominoneb.weebly.com/uploads/1/3/2/6/132683031/4c032d9ebf02c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_60bb5280a2e30.pdfIn PDF document text
    • https://zuwufapiju.weebly.com/uploads/1/3/5/3/135348861/2551264.pdfIn PDF document text
    • https://munazuzane.weebly.com/uploads/1/3/4/3/134350045/ninugamamer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nelivameg.pbworks.com/w/file/fetch/144784941/4177925502.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144607047/what_to_eat_in_pcos_in_india.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144460863/how_to_download_tutu_app_on_iphone.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144553755/diabetic_meal_plan_printable_diabetic_food_chart.pdfIn PDF document text
    • http://xexufokug.pbworks.com/f/rilulegodezeworupob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30deaf1-8769-4a06-8955-72e346ac162c/guxoranakelevub.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/f/vodafovekeganijadewu.pdfIn PDF document text
    • http://wirajudukim.pbworks.com/f/48928329406.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/w/file/fetch/144870321/71768990553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f485cd2-d5cb-4df6-b2b9-f618dff37310/how_many_calories_in_a_renal_diet.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_off0000d10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10B 5112 bytes
SHA-256: f293921e06bb29891421cd8d8a6641d36a55feeb8bb1cdd7489df42bdc4425a8
font_01_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 10464 bytes
SHA-256: 393790c33cf6ad49e287b2ba24d1596ae23056f375bd0629c182216eece98b48