Malicious PDF — malware analysis report

Static analysis result for SHA-256 59dd1e0cd53d1b94…

MALICIOUS

PDF

78.0 KB Created: 2021-09-26 21:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9bdc675a598f7da8937d0651637d6651 SHA-1: e2b085324995a507b3e6720174bf264656d17bbe SHA-256: 59dd1e0cd53d1b94e2b627d264a0ae00b4c3d28e217e50edc37312b77e3e3eb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=malay+to+eng PDF link annotation
    • http://chia4kids.ru/ckfinder/userfiles/files/16055741156.pdfIn PDF document text
    • https://lasanisports.com/files/junizesiturebataz.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613016a17df90---siduxobejavi.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/raxuzonozoniwokura.pdfIn PDF document text
    • https://gornjastubica.hr/files/mivuwaxiroweledoletoruja.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/pexutanavawiw.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/turapalarajelilatekoxeza.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///48082324234.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210908154634_1439924160.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/72866763834.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/damonebemawisinefono.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210922172222.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/22357701204.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210911042627487.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/gijixafusipami.pdfIn PDF document text
    • https://ksboutlet.com/file/files/jutubulejobepebibujife.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/rabupapuderewilurax.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b7f97d70---gakalelerosopix.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/goforox.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/kidafegadedamepo.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/93826698257.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_off0000c4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FF 21268 bytes
SHA-256: e62dc6d9302d4de5d19b80459d845a1de9cee8ac0ef1ca377a2625786e59e5c7
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 10028 bytes
SHA-256: a1b1ded21b6461b76f31db249e2f1f9c3a73bc9a67c1a3ce6341411c7214d5b9
font_02_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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