Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce728f165b8f60f9…

MALICIOUS

PDF

78.8 KB Created: 2021-04-22 05:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 84cca193698458420af59758367eadcc SHA-1: 7fb8d7e8b8c9594e083220c4ad891690644f374c SHA-256: ce728f165b8f60f9e6717738df897e5d9a3b58a44036dd4881ec2c2afffbea25
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a link farm, containing a large number of external URIs pointing to various domains. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a network of links, likely for SEO manipulation or to host phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=amar+chitra+katha+ultimate+collection+pdf PDF link annotation
    • https://cdn.sqhk.co/xenivoronizu/jfWcshc/22215556638.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/jd7JgiP/line_graph_in_excel_with_multiple_lines.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/fwLih4m/61759359461.pdfIn PDF document text
    • https://korexabareruwa.weebly.com/uploads/1/3/2/6/132680962/derimedigu-petoxitezofas.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/ec704e16.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisezepemu/5jgifNL/wetusufimoso.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/kFNF14O/alcatel_onetouch_go_watch_sm03_manual.pdfIn PDF document text
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/0d1976ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sifusavukaga.rf.gd/82758865725.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/kiss_anime_apps_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9905c6b8-e10b-4736-a5cf-a12e6d2e981c/weider_crossbow_for_sale_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a8423d-059a-4e07-b44a-afe012cd2c36/call_app_keeps_stopping.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/minajivubikojawolefireg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1274c4-3826-4a7d-b25e-56411d3431a5/list_of_intercessory_prayer_in_the_bible.pdfIn PDF document text
    • http://wibumumodudofud.epizy.com/zelanekobakodoboxef.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/converting_ounces_to_pounds_worksheets_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b0060d-5a35-4e41-b090-367767532e96/samsung_rfg298hdrs_ice_maker_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4ce644-a60b-4d0c-bf9d-99e423f9c836/sat_practice_test_4_essay.pdfIn PDF document text
    • http://pidekel.epizy.com/48533729476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f1474f-7b10-449b-b3f9-72959287ec01/74164369530.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/bererugelanivasawizala.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/ascendant_movie_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3173e344-87c7-40f0-9654-457f1446e4d3/52204034294.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_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 5272 bytes
SHA-256: 270582daaa2955353f27b99c1fa36b583ed154630ecab815e7faae224f6f6400
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 10760 bytes
SHA-256: 483aebc9dfa3eec8deae6b78bd5a885534e4addd1c3fb2803532203504f4be18