Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7576d3ecd9da577…

MALICIOUS

PDF

67.1 KB Created: 2021-09-23 14:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c938cc5710bbe0f621c9a45ff68133ee SHA-1: bafe57a05ca4cd38295c5ab3e969d0221225a01b SHA-256: f7576d3ecd9da577f8847128a0d020e7e3875e05abba519fbae659096434efab
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only appearance, and embedded clickable actions. The heuristic 'PDF_IMAGE_LURE' indicates a common phishing tactic where a screenshot hides a malicious link. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests an attempt to redirect users to malicious content. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141aee8633dc---xetodojipofedi.pdf In PDF document text
    • https://madeinstlucia.com/userfiles/files/mojamoti.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/34051043560.pdfIn PDF document text
    • http://chayka-svg.ru/files/21745645050.pdfIn PDF document text
    • https://thietbigas.net/media/files/lemegirusi.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/ritugowajavitamuw.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/23654709962.pdfIn PDF document text
    • https://linardi.ru/files/file/jixipewogonoluxasaku.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/pifiwutazu.pdfIn PDF document text
    • http://mlead.net/images/e/file/59733375937.pdfIn PDF document text
    • http://budka39.ru/files/19073131715.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3201e453715e6cee4f7958eff9f8d926/pugududejugevu.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/2785215901.pdfIn PDF document text
    • http://berbun.com/user_img/file/24226428766.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/kovakibituxuweza.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/juzoxanotosix.pdfIn PDF document text
    • http://4darchitecture.org/img/all/gasavo.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/73968559639.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/18105890705.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/88267336669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=amino+acids+acid+base+propertiesPDF 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_off0000ab23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB23 14480 bytes
SHA-256: abcf0fa58c62765fe8c582ee431ccb7c3ffed399263ebf3f03d5895b1cc3b092
font_01_sfnt_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 10752 bytes
SHA-256: 7a5ba137d4a28f1361eda708b3522d1c847d4d2b29158ab789854d582dff61e8

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