Malicious PDF — malware analysis report

Static analysis result for SHA-256 676a9e6527b5bf44…

MALICIOUS

PDF

87.1 KB Created: 2021-02-17 18:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b820f5c6e1e23172a4a09f3ba079dbea SHA-1: 9a51c2f751909d22d2797ca108bb21a794d9218a SHA-256: 676a9e6527b5bf44409ccb0ba10344cb1ee9a88aab6818e2804e752793ea9fad
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=craftsman+evolv+3+gallon+air+compressor+manual PDF link annotation
    • http://copyrightnotices-form.com/92299807473ztyh7.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/d3ba6cd47.pdfIn PDF document text
    • http://tradestaroffice.com/hubli_weather_report_livekm8bx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_6023f2ee84254.pdfIn PDF document text
    • http://stassikorskyi.com/zutupelabawfohb.pdfIn PDF document text
    • https://gunagabivap.weebly.com/uploads/1/3/4/8/134863042/19708.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/zX8cyhj/tixobafitoretuxaxomorol.pdfIn PDF document text
    • https://cdn.sqhk.co/taduzotul/SGtK6f4/christmas_maps_for_minecraft_pe_1._16.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/ai8Xohi/kodoga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5fddc72c880ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366399/normal_5fedf4b501496.pdfIn PDF document text
    • https://zudasejavezumuj.weebly.com/uploads/1/3/4/0/134017640/1067709.pdfIn PDF document text
    • http://hesap-al-sat.com/new_assamese_song_2019_rohedoikj36s.pdfIn PDF document text
    • http://qrastenmap.online/xedivenume1vmzf.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/pexodugosa/dorubofiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/razaxaset.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_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 5464 bytes
SHA-256: bd25780bb9614634eed9ee9833cc36ed374310beb1834fd54c280b9d55ca54a1
font_01_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 11136 bytes
SHA-256: 787e92fad38f248581cd1912208243d89863155aa601c128aeebc5f1c560b252

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