Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b9e886e7710f37…

MALICIOUS

PDF

68.3 KB Created: 2021-09-12 20:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed083d453f5d09eac87b881df8ecc721 SHA-1: 95d1c1c5a31b30127002089ff6b77f86deb31048 SHA-256: b1b9e886e7710f375a211a1f890a90a94e77a412151d53afb1b843d5aa8af2db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://queure.ru/uplcv?utm_term=how+to+do+call+forwarding+on+android PDF link annotation
    • https://solucionaesp.com/ckfinder/userfiles/files/lusepadopujelo.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/romagotetep.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/9275906309.pdfIn PDF document text
    • https://chptravel.ir/data/file/89607124451.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/maxukemebagininulepagas.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/lumoxofogaputinegoxaveniw.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/71902380288.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/41187665407.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/90771068056.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/kigujopunenetezebukav.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/jupivawovadosubapakeroki.pdfIn PDF document text
    • http://effektfilm.de/files/file/80247318890.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/jexakuvuni.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/67495943314.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b64d5e98b3f959cf1a5da1b93493fa1/24579670690.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109021408244206.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/mufaju.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc18bd378---86689294021.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xovapapitotalirowed.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/21873723622.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/96063646971.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/rajuzosel.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/71704137522.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_off0000afab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 14556 bytes
SHA-256: e168350f239f42e1f1f7b164db56bd08db27841d3b7cf26753f23721ba0f9cb2
font_01_sfnt_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 10428 bytes
SHA-256: afefaa38b70490a62ea38c62cb4431bb341d8fcaf3e456846e0df37714f938b7
font_02_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1