Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac77acab51f9a8f4…

MALICIOUS

PDF

79.4 KB Created: 2021-06-02 15:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4f6b018375be8ffc7459a2881021bfa4 SHA-1: daf3169ace04de1a2b3e44e43d0e22edf13965d0 SHA-256: ac77acab51f9a8f4a20adc927b977a142150281164b6d73ee218ffbbb6168fc6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://inwebjor.ru/pbw?utm_term=is+shadow+and+bone+a+good+book+series PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404313/normal_60672e804ef5b.pdfIn PDF document text
    • https://durunefa.weebly.com/uploads/1/3/4/7/134712847/xuvig-zaxoti-jarevurorozofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_600b5377c3177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454164/normal_5fe984f34c0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_604699c83cd63.pdfIn PDF document text
    • https://zogoxakemu.weebly.com/uploads/1/3/4/2/134235374/3700591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_60446b269d800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopofemusun.pbworks.com/f/how_do_professionals_clean_a_house_checklist.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/144497328/83882819182.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413244/vopekebepoxig.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/vefogo.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144419445/bootable_usb_not_detected_macbook_pro.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/la_tejedora_de_la_muerte_libro_completo_descargar_gratis.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144428772/20852449411.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144463596/tidapawerimatoderu.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/f/36635570330.pdfIn PDF document text
    • http://garifukedako.pbworks.com/w/file/fetch/144426753/what_ink_does_epson_artisan_1430_use.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144509535/22080746996.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 5288 bytes
SHA-256: 56827b6039c0710b3822b37357f17a180a085b03ed6cd324825d5b953f0faf68
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 10992 bytes
SHA-256: 0319e6f8bc42e08781441ba4a1e64ec8b65afb22f64c2159fe4be2359b10f2e7

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