Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e66bcf7d9c70929…

MALICIOUS

PDF

67.9 KB Created: 2021-10-01 14:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 363fd869fdf3e62402d71c585084fc5a SHA-1: fa892bd8d529cf42be29aaac943aeaf37f632f87 SHA-256: 9e66bcf7d9c709296ac0f78b2086c451fd40292cb166d76b159ace450e7eaeb2
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b31edb5b8---37597492781.pdf In PDF document text
    • https://apra.pl/files/file/53696628747.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/binifepenovutovufato.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/kabisibaw.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/62410904606.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161381e1d63465---55417236146.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/58063882014.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/zezalulibutolojanunefep.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/99774531055.pdfIn PDF document text
    • http://grabnerestriche.at/zanotujefewu.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/73197511196.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/83236802400.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/98524433456.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/43751373955.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/28248072713.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/puvanubadowobifitogi.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/jizakosozadukoxakelimol.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/xuvezej.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/vinoba.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/tomodufemususeluw.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/falubivetobadugam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=big+farm+androidPDF 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_off0000ae5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5B 14688 bytes
SHA-256: 95cd002c228f2329eb6307e392841bc789ded84d42c7a09757a50f0b54ab773b
font_01_sfnt_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 10308 bytes
SHA-256: f9ea6dd60760eda3cc2a2f975aee3342ca913c75b8926aca145439ea5d513687
font_02_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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