Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fde4ee70dd612aa…

MALICIOUS

PDF

73.8 KB Created: 2021-09-25 14:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82c7b10d279f8784d1001776b127d136 SHA-1: dcac7c19cba25465c8bd8726612c1f6dff567bb9 SHA-256: 1fde4ee70dd612aa911d12be9ffea2413a97ff051ff8eeadead087aa8c2d96ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable hosting and utilize UTM parameters, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=tekken+3+mobile+apk PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134485df066c---88253568404.pdfIn PDF document text
    • https://media-get.com/userfiles/files/dotelomurevaririsa.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/75424741215.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/tatumerovuda.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/53807271205.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/21728497108.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/88549427771.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/799233aa2a637ad4af8cb6cbc39b24f4/zinanosal.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/97201243997.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/94174887039.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/97154393292.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/75943193647.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/15375222426.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/50247977229.pdfIn PDF document text
    • https://toocapen.com/files/vedeguvamutokipamixepo.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/wenigevuxe.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/57028295468.pdfIn PDF document text
    • http://salt17.com/userfiles/files/tusixevosexikugamu.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/zuvufamujuda.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/50616305918.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/90657247010.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/jimagusevixevininumite.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_off0000b971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 19288 bytes
SHA-256: 1d57426d0c1bbd24102eef14d1a47ee0c00945d7feeaf42621f06a5cb014a7a3
font_02_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 10416 bytes
SHA-256: 0973cae3515ab349685bcace54a2c8f5b9319d1f0fe9123998306c3a21f6d940