Malicious PDF — malware analysis report

Static analysis result for SHA-256 77477e0d04e98310…

MALICIOUS

PDF

70.8 KB Created: 2021-02-25 05:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8915f92709a4d6dc0ba08216cf7b3a2b SHA-1: cce71ebf919c167d25ab0aaff36f6f02698bfc79 SHA-256: 77477e0d04e9831076303e24e7f54f1df1f07e3366a81a1976c5c7842616d736
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDFs hosted on disposable domains. The primary URL, 'https://maypoin.ru/strik?utm_term=robert+graves+greek+myths+online', suggests a lure related to search engine optimization or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or engaging in SEO spam.

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://maypoin.ru/strik?utm_term=robert+graves+greek+myths+online PDF link annotation
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/208325.pdfIn PDF document text
    • http://drnextact.xyz/13717160408ml3eh.pdfIn PDF document text
    • https://sizikipumaxa.weebly.com/uploads/1/3/0/7/130739349/kowopesogisaputirola.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/jugetuxi.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/b160ae2847.pdfIn PDF document text
    • http://thesimplycompleteseries.com/lelovuvolamojirolezuvmfht5.pdfIn PDF document text
    • https://juwulonureli.weebly.com/uploads/1/3/2/8/132815178/8592368.pdfIn PDF document text
    • https://nopewiviguzine.weebly.com/uploads/1/3/1/1/131164125/095772fe126f23d.pdfIn PDF document text
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/8522999.pdfIn PDF document text
    • http://nagonakog.22web.org/outlook_file_to_online.pdfIn PDF document text
    • https://wemizufatevovig.weebly.com/uploads/1/3/4/8/134896488/zaxugowewesixi.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/9580170.pdfIn PDF document text
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/puxosefemadezitekid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lixanixuzuki.rf.gd/anbe_peranbe_video_song_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/41535842871.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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 5472 bytes
SHA-256: 9bbac88fa52b5951465ec6e25e32d61e6b9c40671359f8ea8b0447f45ae666f8
font_01_sfnt_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 10432 bytes
SHA-256: 7163d8d32a34a4172e5c91084e10b63e962c3ab3e3b2bbe405dd691ebdbc70e9

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