Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17e55833fd1706b…

MALICIOUS

PDF

67.7 KB Created: 2021-09-17 06:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c142b8601d98aef024c027a2785a1931 SHA-1: 027b3a715c4fc80ca3d782d43ccda9fe5ca53084 SHA-256: a17e55833fd1706bc4897100421a8dbaa64a2dab2b64c1d7be50efd0328629c8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and a small file size. The presence of numerous external URIs, many pointing to disposable domains or link farms, further supports this. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site or download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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 https://demideopool.ro/ckfinder/userfiles/files/ximixomogita.pdf In PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/99750113513.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/77666452029.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/jawusitivodefozarelodiz.pdfIn PDF document text
    • http://info56.ru/userfiles/file/36409305564.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/rabovoderogi.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/xekovafasevukofovebizose.pdfIn PDF document text
    • http://contelex.it/userfiles/files/dolomiwewupexitagopaxi.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae90df460---kibepaponaledutu.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/3471377954.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/042223226218.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210916234718.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/9427734005.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/1820736514.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gawubatusovovefufevojafax.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/90035392889.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/72492276996.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/xiviluxigitigojirorijobab.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/54575948552.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ed369f442be0e9890ff295fad150c301/tilukemaxudadagapake.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/37008582961.pdfIn PDF document text
    • http://hongdacable.com/d/files/34672359095.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/21697170482.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/dozuwirabopuwumopunov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ultravnc+android+downloadPDF 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_off0000af2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2C 10224 bytes
SHA-256: d3a9b2d7a870adcfd3eaec291831a1b64cea9f26935c383e27f43ea401c63abc
font_01_sfnt_off0000c63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 14164 bytes
SHA-256: fa94d37ceedb97e1e2bbba9ec57415a8a794fb57cead70cf91ea0c1845f49d28