Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a9fd8388ceef5f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-23 00:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c079e60eaa7f54cb8b9a3fefdb3cbfe SHA-1: 8d658aaccb2cf92f6a72d05c3ff45115db37ee70 SHA-256: c9a9fd8388ceef5fdd4d07b75eabb8b747c8b58d46787a31f9df0d2fa755e638
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

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 http://bodegaadrover.com/userfiles/imagenes/mopubujeji.pdf In PDF document text
    • http://skmsm.com/userData/board/file/36985097874.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/kuwalefegikofobugolagu.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/rakanupuzuwejuxadaxo.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/32521713495.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/xozorujunujiwidur.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/vasudi.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210905113509.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/vupadidajo.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/modojuxisefapepan.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/wokufuk.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/zolokerazofuzobetowem.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/sowemarifasekajukune.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fed98b0e2f---32911756322.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/xiditovolukox.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/39341179276.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/rexufuvutasumabojifeweku.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/4659585991.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8717fe7b---gefaxizomixi.pdfIn PDF document text
    • http://myesen.life/userfiles/file/zezuwinamovogaxote.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/rofebuposigogaruzagiwuf.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/44297233402.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/57643547969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=olaf%27s+frozen+adventure+full+movie+movierulzPDF link annotation
    • 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_off0000b2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BB 10800 bytes
SHA-256: 4ea2dd1a21954ef19645cf30051207258fc6159e3f318220bd2329da56b1bd1e
font_01_sfnt_off0000cbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 16168 bytes
SHA-256: 3f94ca31efbfcbe1da19273ac17c7b78fa31dab46cbcd769effa18620c407320

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