Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47b9b7cd8132c5d…

MALICIOUS

PDF

75.9 KB Created: 2021-05-31 15:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 798c213dec0a000dbb896aa8ae1ee509 SHA-1: a5729d56009f015c8785835f48381196984e94fa SHA-256: b47b9b7cd8132c5d1a5364cf2e48f1e78cb1a4f8cbe601669a86042a57a61c16
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://inwebjor.ru/pbw?utm_term=how+do+i+find+world+war+1+service+records', is presented as a search result, likely to trick users into clicking through to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://inwebjor.ru/pbw?utm_term=how+do+i+find+world+war+1+service+records PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409093/normal_5fe0a9a26aaab.pdfIn PDF document text
    • https://vabusise.weebly.com/uploads/1/3/4/3/134385335/7b12dd158145.pdfIn PDF document text
    • https://mudobimug.weebly.com/uploads/1/3/4/8/134853100/lakukuvimono_jowivofinavotip_bafive.pdfIn PDF document text
    • https://sonatovixafu.weebly.com/uploads/1/3/1/8/131871956/9104124.pdfIn PDF document text
    • https://xikagarema.weebly.com/uploads/1/3/4/4/134489929/kixumasivobelejoru.pdfIn PDF document text
    • https://bojozavo.weebly.com/uploads/1/3/0/7/130740433/d09c9f7e96c.pdfIn PDF document text
    • https://nufupegovofa.weebly.com/uploads/1/3/4/1/134131424/56538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ff31983730b0.pdfIn PDF document text
    • https://zetopemonosur.weebly.com/uploads/1/3/4/6/134678414/8653199.pdfIn PDF document text
    • https://dumamigurox.weebly.com/uploads/1/3/4/3/134336195/1377696.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/dododiporizi.pdfIn PDF document text
    • https://tekerigaxigo.weebly.com/uploads/1/3/4/7/134702693/9198741.pdfIn PDF document text
    • https://jatisarekitikez.weebly.com/uploads/1/3/4/6/134661612/7a98af5b2e2f23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393502/normal_6060565a1ad8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_6030ed36bb7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_604cb2d3a25c4.pdfIn PDF document text
    • https://siralukamowifi.weebly.com/uploads/1/3/1/4/131407299/2801100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fe81ba218d8c.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/655145c1-e082-473b-8bc4-36d0a58520d3/learning_how_to_use_a_computer_for_seniors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b8fde9-cdc1-4355-b403-61663c9da49a/49420189392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c85b15-3cd5-4c5a-a06a-4c5dac14f524/how_to_put_symbols_in_excel_formulas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1789525b-0f83-464d-aa4c-39d6c792082b/bissell_crosswave_pet_pro_cordless_max.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_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 5180 bytes
SHA-256: 569bdabaa5e37b6ce614a0a53236ed50d65fb9855703dd01fe3219a793e98d2a
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 10840 bytes
SHA-256: 6d744b4afc7b64b2bbd27990cd4d0aa878913c440f8d45ec784531b0421d4fdc