Malicious PDF — malware analysis report

Static analysis result for SHA-256 921c568236b325f7…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 13:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 305bce6861349136a514ffe3132aa5f6 SHA-1: cd8a5caf178b55f8f481d8fc5b76fd3e4c9b7e53 SHA-256: 921c568236b325f7b24a80948e13a8011415757efa9da7497408614893dacc91
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, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://allineers.morefriendship.com/upload/files/68469896208.pdf In PDF document text
    • http://www.halpellet.hu/userfiles/files/87914639642.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/14221194006.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/28398339998.pdfIn PDF document text
    • https://sergiomauri.com/images/file/99617644182.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c59dc100---19476491214.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/12071603693.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/zimazufesixajinebap.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/92571633608.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/54856288027.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/pakewo.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/94ee805ea0c1a094e515d6f43d3d60b9/69376227948.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/56829157743.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/kemidoraxisikube.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kemegowolakedikafoti.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/61970303867.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/topokuxi.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/48258905999.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/ribobekof.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021092406522955.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/92753273806.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/dedibarusapiluxofosu.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/buvemajizumarusuwegugosur.pdfIn PDF document text
    • http://elsped.hu/files/file/wulowonovuka.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/92645750889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+internal+storage+in+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_off0000b605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 10500 bytes
SHA-256: 556c06788752754656a714d3960702c68a6aa64bc29c74b9aa10eb7282793d35
font_02_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 18768 bytes
SHA-256: d400745b9323f6f53820536aadf3312309a94de7b84834174892badfc61336ee

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