Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b80fa7eb9e94fd…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 19:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d8ac3b2bf218aaa8d957b704d191baf SHA-1: 0a3bf8011e436a6d0f0a77b09719ac6cbcf59aa9 SHA-256: f2b80fa7eb9e94fdbc39c419b4b0c900d6896e1290d4a55830df4418deb052fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious and phishing-related. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number in a context suggesting a scam or tech-support fraud. Embedded JavaScript streams were also detected, suggesting potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=redmi+9+prime+camera+specification PDF link annotation
    • https://narellesastro.com/userfiles/files/4882248963.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/wasivuletosow.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/72216311923.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/vezepakuzaxobu.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/sudenijelakopumorila.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/27594336023.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///31616533215.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/88363042298.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/95279179468.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/45188920992.pdfIn PDF document text
    • http://dejede.com/userfiles/file/85395558489.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91221674437.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/81583377561.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/rabapakal.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/80163149926.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/53354129928.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/30078794661.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/tevolizidafukaduf.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/folelapokivavodisibapiza.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/bupuxogugolixunomubofuba.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/famakojomanudanowotare.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136d9366b491---mekexaligovukopenorubone.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/lesidegijapifo.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/22900372196.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_off0000ce87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE87 10948 bytes
SHA-256: 0d7c2575dc7b4dcf365fe060b5a7b1c0bb374149761072b9a1ca215ec4e22a80
font_01_sfnt_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 18584 bytes
SHA-256: 1a3458ee71a4564bc74d526afbc82a77cc7b8e2dd7c018bfdc7d3f150e0864e1