Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23ff98b57c2a123…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 20:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75b87f26f7fd68e07fc5008a1843a324 SHA-1: 8d5dbc6cdbec3aada67b55c476191bcb51bd2599 SHA-256: d23ff98b57c2a12349b4cb8e96f2394307a79cf71e6c6115b00f8b37d1b23caa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using multiple domains and UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=cute+u+video+call+mod+apk PDF link annotation
    • http://dgjinhak.kr/DATA/upload/files/202109100804223588.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/segilalat.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/50819168054.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/77cirnn8hq1731oskejmcnlh22/1407735392.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/joxuwipefurikapojokivafa.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/73542165164.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/zaziramogazuzinowinago.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/30012228108.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/kawidopukopilof.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/mevabofejofegokefesoga.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/89712884347.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/fibegagivobiseteruk.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/77101887526.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/wijobetalejawol.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/63737286706.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/26778269801.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/78520782127.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/18561772064.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///18544312430.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a7f11368d21389e88c572dcfa65845eb/vupowiruvafonaba.pdfIn PDF document text
    • http://agilesolutions.in/uploads/tovope.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/fufivelusumawuju.pdfIn PDF document text
    • http://dalaichau.com/files/botizabonopij.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_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 10592 bytes
SHA-256: fb9ca218423879c3f87df8debb2517fdf4b82ca23f716410b7c0217c68240f3c
font_02_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 19536 bytes
SHA-256: f0ed90dabb6a7bd05a779b340e7bc9e5da895e126328974db322bcdb1ddeb3b4

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