Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04d8c11b60d8864…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 21:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 849993dde14d016427cca9b2d2ebe7c1 SHA-1: 27f012796c11742c4e003f09ef6826406f3c3982 SHA-256: a04d8c11b60d8864b41f6713b8d6088fd593c771c29979107edb8648787c8237
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=goku+black+and+android+21 PDF link annotation
    • http://www.mab-solutions.fr/upload/file/81190200566.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/kekajewonobufudu.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210904035100_1032688078.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/65001201914.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/71353963964.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/soruvas.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/sumodugexanobomakufemi.pdfIn PDF document text
    • https://network-italia.com/file/64565860639.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/nagadogolulojirilero.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/72592564575.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/60216832731.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/89726248844.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/mofevogepodufubujebut.pdfIn PDF document text
    • https://thepainter.asia/upload/files/xejebojoletolugejosaxi.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/17409265357.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/toxize.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/zufimudepo.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/fipiduxug.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/rapitekuvolo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3gh309l06njk1viald7lpln606/rebatinus.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7mjktg82q09vjnh5rsfbgcpdlm/95369914007.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/71864803836.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/zovuxadosep.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/60434074855.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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 18404 bytes
SHA-256: bda798df16b303f2bb75f812992490ac8698eb40648891d148af8328253fdc53
font_01_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10508 bytes
SHA-256: e4ff2d6ae8e378323cae970470bc1fea67f6a52d473b5666eb7473edb100e3da
font_02_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1