Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42543ee1b21d28a…

MALICIOUS

PDF

69.2 KB Created: 2021-10-04 08:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9778799ee2b2dd3d43484900422d9103 SHA-1: 9ecc89b3750b10f24393e48bdf38621888e98ba1 SHA-256: a42543ee1b21d28a49cd11c5acfa0500282a8a35bc4f68d3a82eb942041b2038
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to direct users to malicious websites for phishing or malware downloads. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=solid+in+solid+solution+example PDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e743e7380---jokovokosomanegasidero.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/zetonavozulug.pdfIn PDF document text
    • http://bankerz.in/qpic/files/80570311680.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/55582550628.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/53226034973.pdfIn PDF document text
    • https://tcremich.lu/files/files/69718163917.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/52133209906.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/wixivovigu.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/rapalugaz.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/63323500407.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/25798768359.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/fawemasavo.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/62055394191.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/ranazipoxibi.pdfIn PDF document text
    • https://ienter.bg/files/jepumafamumibeselobiko.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vigikapiratamalogedewufi.pdfIn PDF document text
    • http://hibertek.com/image/files/20211001_172739.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/68786982967.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/mudipomir.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/wakilujinejuwoxipiraziv.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/96711304062.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/wimunufibemegumunofal.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/30164765520.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/1593434065.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/1096115461.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_off0000b059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB059 10732 bytes
SHA-256: ca16ab49febcb571e408674dc40bade31b458dc43dddfa48cfd191950e339218
font_01_sfnt_off0000c8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FE 15176 bytes
SHA-256: f06854e8300d885f28fae8be8d2b81ddbf5d75f3e70cafec00a3c0d08efa1497
font_02_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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