Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caa65462552efa5…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 11:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 450c1cd6e2cb8623b896a1915b813288 SHA-1: 68b0c63908591a7dfcead85e93efa68cea1ce56f SHA-256: 3caa65462552efa55dbecc82e3aaf03966e7bc48ef64bae6215f425290968244
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, including one that appears to be a redirector with a "how to reset network settings" query parameter, suggesting a lure for phishing or scamming. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing attack, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=how+to+reset+network+settings+on+android+tablet PDF link annotation
    • http://gospelpour100voix.com/fichiers/newsletter/file/55285639317.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/disagaduz.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/tapezedez.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/woxupuxe.pdfIn PDF document text
    • http://intersonik.eu/upload/files/vogejojinurolerawedidepow.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/31177110340.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0bdb4547---62063352660.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/57761581501.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/71408292525.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/dotajixeridetofupe.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/gemefudexu.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/rasupimorozore.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/dirinofizikog.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cf63a872391de29ad7b6c1ce0df504bb/zabakepawisivape.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/49939199698.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/sawaxiwawovukozomowuf.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/leseroxiverepuveninepu.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/96017470334.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/88743986054.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/sogolizebojubuzovisosi.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631490319.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/wadulutulurajofubugaliz.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/86919985159.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 10732 bytes
SHA-256: 6be70588ed7ef7017f03c98202cadd20b11b16bb2a60ee43a6b9f9e0de91b899
font_02_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 23364 bytes
SHA-256: 329a622316604d1b6fee9fcd3ff9f23c6d73fb1eafa171ca132643e2f13c4b5f