Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cfc4c828751347…

MALICIOUS

PDF

81.1 KB Created: 2021-09-24 11:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e7041e783e9e438e035458260aba2fb SHA-1: daaa36e601455ed8a5607b39d78ce9f1e9898f08 SHA-256: f7cfc4c828751347ecf863de65da3cdf896194888add878ec495b6297bcc6dcc
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 and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous URLs suggest a phishing or malware distribution campaign. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=who+call+apk PDF link annotation
    • http://xaydunganphubacninh.com/webroot/img/files/66082648797.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/wuropunizukibukabekokavew.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/14377084710.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/luwur.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/sojanowofakafobofusuju.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148ebfd8cdba---39239963130.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/nuxadusojimufatapinego.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/powuziwajuzonatasafa.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/48338939349.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/wigojopiga.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/xakepasenupife.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/bevijedasinisowev.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xudukotaduga.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/34161833472.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/27214648326.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/gelawaxabenejilezaresuze.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/jevoge.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/71286659510.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/27421249248.pdfIn PDF document text
    • https://limsurdua.com/contents/files/tuzefavaz.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/84434699036.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/9297641520.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/sovuvi.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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 18588 bytes
SHA-256: 31664353b26ed2d992e99e37dc0a67f5e6a6571ddb3ed24bf7ee05891ae356a7
font_01_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 9864 bytes
SHA-256: f4d367500c8ff00b5aa46dc1e6d36bedb69812546f4e71226103775d3a597bf5

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