Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb00e602524faceb…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 17:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3434e54cf16002a2f53a48bf8bf5b74 SHA-1: be6f5a5b0a54980ff02b226628a5030d4a4eb3ab SHA-256: cb00e602524faceb2f336e75a03c1b83b73ef9ce4a1ac5a17ab65366c013efb2
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 functions as a link farm with numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs align with common tactics for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=java+concepts+used+in+android PDF link annotation
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/30418984308.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/96023651366.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/090518283381.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/73985865082.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/zikugobepop.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/56690761280.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/13669701691.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/jisarob.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/xugotoleberojiwodus.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/94109488782.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/firibonutigevane.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613424ca9a5db---75143185472.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/fowijakatodexujobeger.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161383752777a1---95728610463.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/45984173258.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/perasolemef.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wudugamutuzutog.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/25851108328.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/tisalugajupuwi.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/rasokuna.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/semakuzasusakivovifoka.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/84332121105.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/42840418244.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_off0000b85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 10620 bytes
SHA-256: 8791272068bce3def67abd5687c756e14ec31af9af58d177dccd5107fd02d9ed
font_01_sfnt_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 16216 bytes
SHA-256: c5ac53ae3623aa8cbbc75a16049655b3e0271b7b280c8e158e5653691e8de00b

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