Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b03bf3bc715b0c8…

MALICIOUS

PDF

69.9 KB Created: 2021-02-12 01:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 9df2eb10c4879567870d3bc68b8312fc SHA-1: 01a4c3691b10b8bfd007ea4e2859c65be58ba88a SHA-256: 4b03bf3bc715b0c8321a517cc48e379328dd4cf43a1a7b2a897933ece1ef40c7
186 Risk Score

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://druttle.ru/wix?keyword=bonding+basic+review+answer+vocabulary PDF link annotation
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/lekikivuwufusitapof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381289/normal_5fc692026aaca.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/rebukogilegapogo.pdfIn PDF document text
    • https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/vogulitenumipivi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_5fef9cc6f153f.pdfIn PDF document text
    • https://xofusifusu.weebly.com/uploads/1/3/5/3/135312872/87e2023e.pdfIn PDF document text
    • https://tekuxarutupun.weebly.com/uploads/1/3/0/7/130775258/6020182.pdfIn PDF document text
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/9664004.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489237/normal_5fe0ba6c82986.pdfIn PDF document text
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/7185086.pdfIn PDF document text
    • https://jezipupokegem.weebly.com/uploads/1/3/4/0/134042816/tofoxuworozo.pdfIn PDF document text
    • https://vobilazi.weebly.com/uploads/1/3/5/3/135300702/2597603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_601f94b3a8e5e.pdfIn PDF document text
    • https://gorenusedom.weebly.com/uploads/1/3/5/3/135326887/4231107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/picsart_apk_full_2019_hack.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_off0000d4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AD 5548 bytes
SHA-256: 922e7d4422a9b726bdb6992071414d51b4e02b0a1750a3993603c3ae80e3f069
font_01_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 10176 bytes
SHA-256: caa7ff2478e64c2855328d263eafc17a434f2523fbda9fb1d21a8023aee91a98