Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98e119e5ee0e5f6…

MALICIOUS

PDF

77.0 KB Created: 2021-04-21 15:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4f8d52fbfef794acd0b3d3638b4c7a46 SHA-1: eeb82ae4de093770990c8eba3fc07a80d5985b54 SHA-256: c98e119e5ee0e5f62923d6063608573c1123bbb9e15840ee14af8f83966fb9ad
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including critical detections for PDF SEO link farms and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=gateway+ne56r41u+manual PDF link annotation
    • https://fetozala.weebly.com/uploads/1/3/4/6/134678703/xekuxewe.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/urea_formaldehyde_resin_safety_data_sheetib1zu.pdfIn PDF document text
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/lewozakowu_jaralutetakos_bagujusises_kelepu.pdfIn PDF document text
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/buritekosakile_roweranuzal_wexeberakili.pdfIn PDF document text
    • https://faxakitowe.weebly.com/uploads/1/3/1/4/131437357/jarozipisa.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/how_do_you_make_a_lego_turkeydcth2.pdfIn PDF document text
    • http://es50off.pro/creditors_ageing_report_in_sapwe0mi.pdfIn PDF document text
    • https://bidemujoniju.weebly.com/uploads/1/3/1/8/131856381/81ed6d49a04f.pdfIn PDF document text
    • http://stepka2016.xyz/65913326764s7vos.pdfIn PDF document text
    • https://pivamuwonojazop.weebly.com/uploads/1/3/0/9/130969183/zuledatijuwofi.pdfIn PDF document text
    • http://tesepaxe.iblogger.org/asme_section_viii_division_2_download.pdfIn PDF document text
    • http://investmag.org/modern_warfare_2_wii_release_dateua78q.pdfIn PDF document text
    • https://gedamalemomomig.weebly.com/uploads/1/3/4/5/134504316/77cf3.pdfIn PDF document text
    • https://nobarikanu.weebly.com/uploads/1/3/1/4/131483152/4052554.pdfIn PDF document text
    • https://vabadagijuruka.weebly.com/uploads/1/3/1/8/131856539/molelefojawu_pudowugog_lofog.pdfIn PDF document text
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/kapejuxe_gijevasad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vokuwomibaneseg.epizy.com/oracle_database_11g_pl_sql_fundamentals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1bf95e-7a1b-41fa-9313-b71f58df442b/putem.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/wuvatijugunevadisulojime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed85461f-c3bd-4f82-b1c3-49acf23e996c/53034245695.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/14092531732.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_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 5296 bytes
SHA-256: cfa8ae8563556608920caf8c8d6dd2cc665788ff7028103c4e9ed7af6878dfdc
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 11208 bytes
SHA-256: ae685c3afc80bf63cfc9cc1c334a0f50f57b9d3e7e7c7098e03398fa9034a949