Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad99c04d66854af3…

MALICIOUS

PDF

77.1 KB Created: 2021-09-21 17:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9dc2978499a8c3ae98a5fbd405b00671 SHA-1: 1477e46f7ea9d2168250d573363a1d8bf594599b SHA-256: ad99c04d66854af3d066166de7233510acef8d6bc98ae54cc9469c13acaa7cbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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://coretry.ru/uplcv?utm_term=super+mario+for+ppsspp PDF link annotation
    • https://wolfgang-photography.com/userfiles/files/kiverawasibavudoxiwigaji.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/wubej.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/geduzefugepajamujonup.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/74409948242.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/zapasesejuvosizejusamabum.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/84898953174.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109042313166500.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/foxuweveditonawip.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/35904951893.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/mudazivalonapiworen.pdfIn PDF document text
    • http://lyshiying.com/d/files/94875046212.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6a750e0858e88d478c4ece654084b2c1/63282500396.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/36622938380.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/bopenudonu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e96d34d5bf9157cf21c6341b1010e61e/74841760290.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/17250938845.pdfIn PDF document text
    • http://c-six.it/userfiles/files/47970735228.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/lilepidigig.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/29859795907.pdfIn PDF document text
    • http://robedecreateur.com/img/files/seboxomoleduxevomoli.pdfIn PDF document text
    • https://menu2uplus.com/images/file/pasarozagodolagabude.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/26346097103.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/renoxerokixalobesa.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/2082788878.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_off0000ca3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 10444 bytes
SHA-256: f7c6988416cb81eb124abc1d172bb6436cfe19f6c33d3e65c0253cbc70ff0cb7
font_02_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 17528 bytes
SHA-256: 23b6253e52f474e24d48492f9538d5f5f8a418458ae048aae4a50b95ea8c9b2e

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