Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70a390e0c8e948f…

MALICIOUS

PDF

86.2 KB Created: 2021-05-29 10:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c3f5786f5c464889236ff54eb8342206 SHA-1: 2c531c83ea96f6be81d548aa3d3c9ad5fb77b53b SHA-256: d70a390e0c8e948f7a2398a49608508e96612baf449f2feaf0383dc14881107a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the use of JavaScript for link manipulation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/strik?utm_term=samsung+galaxy+tab+a6+10.1+protective+case PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408862/normal_60236db96b0a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445736/normal_604f2cb585bc8.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/0e15adf5224a385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_602fa9355bce7.pdfIn PDF document text
    • https://lobuponumabezi.weebly.com/uploads/1/3/4/5/134508668/jubolojene_tiwavurijimiko_lukivotufas_rasimabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460247/normal_603e77a215e3e.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/kigufojapubejumefi.pdfIn PDF document text
    • https://raxasowofano.weebly.com/uploads/1/3/2/6/132681821/wepido.pdfIn PDF document text
    • https://timelasabo.weebly.com/uploads/1/3/4/3/134345700/b0de72a6299e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424985/normal_604348d79597f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374359/normal_5ff90b5b5b33b.pdfIn PDF document text
    • https://gazuxupoje.weebly.com/uploads/1/3/4/1/134108966/a4a765b8a4adacf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369146/normal_5ff650267c334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_6055ffc4d1ba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_602404d22f0fa.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/8075622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476294/normal_5fe1d2de60bd7.pdfIn PDF document text
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/4221102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488139/normal_605c453af3e9c.pdfIn PDF document text
    • https://gofubajub.weebly.com/uploads/1/3/4/6/134632898/5361300.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/e0534a33-6b16-4a72-83f6-353ad049583c/is_ssr_good_for_stocks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e610f802-eb71-4738-bcf9-05834299e358/microsoft_excel_bangla_tutorial_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05640d8d-c507-408a-99f2-3b971b57f90e/78869036332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a563bf5f-3fa0-4e4b-87c9-e5251f3f6e55/ladopivabidebaginopilex.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_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 6108 bytes
SHA-256: a5653b04bb49de188adb6907dc723a03aa60c1fee039a4a99fb3058eb46a1b3e
font_01_sfnt_off00012512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12512 11136 bytes
SHA-256: 974b081d173c3779fbe24b1be0c4b4c6f859b21a6714aa189f541c0ad3b267a5