Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e1e56c15866d39…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 21:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b478592810c102f401c355e7787f01e SHA-1: cb578bb113ffcf5bbf29bf9f6a5c692dae3f3efe SHA-256: a2e1e56c15866d3914f93d370880240f68e54c7cd9181a51aaad790e2dc92994
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, suggesting the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=vidmate+apk+13+mb PDF link annotation
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aeda2ebc4---69637966338.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/supddkhr08ec29k95ku3m5a6v4/99186914494.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/mapofij.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/54712437392.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/15768017725.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/93641578273.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/48562531258.pdfIn PDF document text
    • http://metabolit.ru/files/file/10491792886.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/88552966222.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/67085125129.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/56080616352.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/83616843273.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/51435251443.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/27220783633.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/47056795269.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/89370215795.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/34034396226.pdfIn PDF document text
    • http://friulanapanini.com/images/file/widetoro.pdfIn PDF document text
    • http://safetruck.gr/images/file/82583448385.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/solebek.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/57789454737.pdfIn PDF document text
    • http://15881588.com/ckupload/files/9423430926.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/57967210738.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 10440 bytes
SHA-256: 2c8349f82ec23ba9b922fa743df51771fe2e4189df5c06b8760abb57fce5662d
font_02_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 18996 bytes
SHA-256: 88f37d36cf2841dd29e2470263a71512a5b7a9cc56c94700165bc7c1be843019

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