Malicious PDF — malware analysis report

Static analysis result for SHA-256 3057727db4e8a000…

MALICIOUS

PDF

75.0 KB Created: 2021-02-22 03:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f3dcb0a67f1163adb1edda569ae44fce SHA-1: d12918e9f8f03be4287e24d118463d318222a8cb SHA-256: 3057727db4e8a000a27e68abe237f8de3a3f59176e4f21d0c9432c61e695a189
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=pkms+summer+reading PDF link annotation
    • https://cdn.sqhk.co/zojixemem/hgGifHJ/sokugomawizigigetakuno.pdfIn PDF document text
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/aae48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477167/normal_5feedbd7565b8.pdfIn PDF document text
    • https://baxufolodamiz.weebly.com/uploads/1/3/1/4/131408032/wozutevin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_60330bd040d68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_602c0569c70b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_600a4e5eaf709.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/YliggxU/vesazakatuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420612/normal_6008ca794a81c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385412/normal_5fcaeeb79fbcd.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/jhjfG37/wavixezitadizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_60116b38dbc79.pdfIn PDF document text
    • https://cdn.sqhk.co/sebuwemid/BhgkhaG/usda_forest_service_parks.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/pSzgeUs/retro_galaxy_wars.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/9edheNk/harry_potter_puzzles_spells_download.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/j61NdMv/25123804074.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/bhb0NFK/samupugobixexekafip.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/c6heyCy/good_dinner_places_near_me_now.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 5176 bytes
SHA-256: 5dfec09fdd5008c17f06de19809c2fb743e8427f0dc6abffd86e37bc270cbff2
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 10808 bytes
SHA-256: 35452f46585d4de097cb810d4bcea97070f1c9456dda1f882ad8d5d6ba8bfb95

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