Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aaa4b335e642667…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 08:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26cdc17bf48f0735451ff3298904cfef SHA-1: d11b5817cd7d37860efc490e334aca8c701f621e SHA-256: 0aaa4b335e6426679d4d0ee7f0166a1b4670b77f87c278bc26fab75897b5f29e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. The presence of many external URIs points towards a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://queure.ru/uplcv?utm_term=android+penetration+testing PDF link annotation
    • http://arsvet.ru/img/upload/jorarotudegabot.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/52329556584.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/2077423974.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/33164686879.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/turinenijejifegi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/86806313571.pdfIn PDF document text
    • http://tulga.ru/editor/files/96451503083.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/63199742548.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/67268613483.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/92840358802.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/zowedexikojetibotim.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/vilivelofupiz.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/27267363527.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/puripivapivewis.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07f5b9399---30608100364.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m0ncblmhrob053i2givv7kjh45/31503433799.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/33252542504.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_off0000c558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC558 18544 bytes
SHA-256: 27a58cd9ece18d81ffc85332e1675f3b9d055889454755d193698202da3a6a08
font_01_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 10504 bytes
SHA-256: ff6bc74ea24947d4b9392614632eb174128461ed6ea093051118df3df7b13f13
font_02_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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