Malicious PDF — malware analysis report

Static analysis result for SHA-256 b712ed781911db37…

MALICIOUS

PDF

74.7 KB Created: 2021-01-28 16:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 53779d17b3392a70b27fa942b9da8b51 SHA-1: a2b5c44e9294d57df8df5d3c11bdc204f4f2c13c SHA-256: b712ed781911db377bd921791bca9be60c1a815b884c466157c877cffc8393c8
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, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/wb?keyword=real%20piano%20for%20toddlers PDF link annotation
    • https://rudotuvesil.weebly.com/uploads/1/3/5/3/135398110/2e6c42e.pdfIn PDF document text
    • https://xinewufovina.weebly.com/uploads/1/3/4/2/134235071/4761681.pdfIn PDF document text
    • http://businessoutsourcing.info/27539195555qugle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5fd67cac5b4a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fd6854addaba.pdfIn PDF document text
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/7817524.pdfIn PDF document text
    • https://lemuwepino.weebly.com/uploads/1/3/2/7/132712354/moladoz_ribiput.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_6005fb8b6afde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454995/normal_5fecc8406e3a7.pdfIn PDF document text
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/rupoz-zekure-zazebirebalefa.pdfIn PDF document text
    • https://rarerosedipise.weebly.com/uploads/1/3/4/8/134876587/8367104.pdfIn PDF document text
    • http://medyahanem.com/raptor_660_service_manual4rnqb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366408/normal_5ff36a95813b1.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/nibapozomat.pdfIn PDF document text
    • http://lisolu.org/top_10_american_ninja_warrior_runsqmchu.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/cb4d2c.pdfIn PDF document text
    • http://hh666o.site/julovega6zbz3.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/davolazupivowi/cesaro_theme_song_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/destiny_s_gift_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/100_egyptian_cotton_percale_sheets_king.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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 5040 bytes
SHA-256: d9ffd5f46c354a1031097b8cc16b884459dbe4006b08d1a97f55c08c7a15463b
font_01_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 10124 bytes
SHA-256: 73cb1f5eb592bed40e8fe1e4abaf2074f55ac71cf43545b6f8884543a7186208

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