Malicious PDF — malware analysis report

Static analysis result for SHA-256 4618eaf7fabd0d2b…

MALICIOUS

PDF

78.5 KB Created: 2021-03-16 17:06:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d2f5e8bc687377066f82a456211b30e9 SHA-1: 9e740ef78dd6d9449ec3e24ed17289d0f1e6b06c SHA-256: 4618eaf7fabd0d2bc8c02542792ee0610d7da8454e16e0d398416292ea420e50
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=english+grammar+book+class+9+10+pdf PDF link annotation
    • http://table-wait.com/bavekaduriwigegifowifitafcfbfc.pdfIn PDF document text
    • http://temezisabekazev.iblogger.org/jivebegibix.pdfIn PDF document text
    • https://tawisowa.weebly.com/uploads/1/3/5/3/135315305/5822676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_604ce40439725.pdfIn PDF document text
    • https://jibidamo.weebly.com/uploads/1/3/5/3/135337573/9545337.pdfIn PDF document text
    • https://tinusibojuzikat.weebly.com/uploads/1/3/2/7/132711981/dewatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_60144eeab4d51.pdfIn PDF document text
    • http://kalavar.xyz/joderisanozimefiguxivegody06f.pdfIn PDF document text
    • http://zifasito.22web.org/rudofsky_architecture_without_architects.pdfIn PDF document text
    • http://sagebiwepul.22web.org/investigation_4_diffusion_and_osmosis_lab_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb34b76-daeb-41d6-b175-7e06d84f7e85/gonuril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae08005-e641-45f8-b339-533074e7f21c/how_to_repair_widex_hearing_aid.pdfIn PDF document text
    • http://vuwilup.epizy.com/67312435886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829bcba3-b621-4e39-bb9d-8e787abdbf40/what_hunting_season_is_it_in_vt.pdfIn PDF document text
    • http://nevejekegasa.epizy.com/3375252794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23489c5c-8edb-4e92-b316-5ff10a122c8f/why_do_you_want_to_be_a_medical_surgical_nurse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60638e4c-ce41-4e2d-bea4-5a187d2f0ac6/13798302136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fc401d-a2a0-445a-a07f-6639e8d07181/mercury_9.9_4_stroke_carburetor_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede147b1-837f-4545-b0f9-411f2e13527e/93006468669.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_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 6080 bytes
SHA-256: 7cb948cbe9e46858f770d87d63e879cf8761afe8d79ac39cfb724ab54b27433e
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 10888 bytes
SHA-256: a83a589ad254203bea53034a7f075e417d44701d85fa584dc7e3980e02aa27c1