Malicious PDF — malware analysis report

Static analysis result for SHA-256 77793c28596599a7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-14 11:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c649f9e3befab916b99253503d7529b SHA-1: e73c85ed678b005bed4beaafa666b7d1ea082932 SHA-256: 77793c28596599a71907ace40c4d06bf361a921de1fdc4e0e12a13c641198b41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://synerhu.ru/uplcv?utm_term=python+crash+course+latest+edition+pdf PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1n445o56cpcf2seoaltfk5fc24/kedalivejajalubiwar.pdfIn PDF document text
    • http://anninh247.info/upload/files/78143529302.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/74611307886.pdfIn PDF document text
    • http://sieuthibds.net/images/files/40318393899.pdfIn PDF document text
    • https://mauspro.net/upload/files/wudujurexir.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/72602494731.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/keferofexejivalex.pdfIn PDF document text
    • https://thehouseproduction.net/file/timuje.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/buwipi.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210909_508E9C209AABC08C.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/76925446264.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/bibabamonufasifewizopavi.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/84388905454.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/640703042.pdfIn PDF document text
    • http://htwy.com/upload/file/batutilupowi.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/79847484294.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf48a405b3---920682642.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/41618951821.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/mikatogenopojawogekosuxo.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/48034557176.pdfIn PDF document text
    • http://rayer.cn/d/files/43997404118.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/ridagetujituz.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/82444364682.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB54 16520 bytes
SHA-256: c2ab3d84a4e30ff65f02081e56198643fdf372acf217817c6b9771e0b18eabc7
font_01_sfnt_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 10932 bytes
SHA-256: c4eb0a8563f6d3ae19c090e0cd01c10a2067079c7a42d3490454d360bcda45a2

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