Malicious PDF — malware analysis report

Static analysis result for SHA-256 5949d54a02f2c7c3…

MALICIOUS

PDF

69.1 KB Created: 2021-09-12 06:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b5a4a1bd3b36933db414a4b64264439 SHA-1: e836fdc25ca12cc4c8f1001409ce7bb959ab1c9d SHA-256: 5949d54a02f2c7c34ca2da483470cb5e637237379c1d4492f0e9bd9363a21b3c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to obscure the true destination. The presence of embedded URLs and the overall structure indicate an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dammesliepas.lv/ckfinder/userfiles/files/96665884964.pdf In PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/digiwelududifola.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/rizujeko.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/tesokogotageluleseviko.pdfIn PDF document text
    • http://huiking.cn/uploads/file/070114276010.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/64224459342.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/vegiremevox.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/10459391966.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/88430823858.pdfIn PDF document text
    • http://sdds.be/userfiles/file/97105777392.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210901/files/20210901131628.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/bavajuko.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109010701049959.pdfIn PDF document text
    • http://vanhacollection.com/images/files/67615323063.pdfIn PDF document text
    • http://pedraferro.com/files/files/18574336983.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630518397.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613626a18dc00---gefazawababojug.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/88054867885.pdfIn PDF document text
    • http://napiarsaigh.com/images/19122933173.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/timegeselaluxatom.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/lusotuzolulolotebuxenuzok.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/28993534364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=stock+galaxy+s4+i9505+recovery+filePDF 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_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 11360 bytes
SHA-256: 7b01656568a79955eb01f33e715bd76b147139a46cddb954333e83c696606b1f
font_01_sfnt_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 14532 bytes
SHA-256: 29aa2e1f6219221754fed4020b6ebb9586a9b6296f11b3525b217504d34f7694

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