Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97512b4c41ea269…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 22:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d78bb736d158902446648014a106f149 SHA-1: aadf75a0d27ba54920d4e5b8f75c21a65bf61b8b SHA-256: a97512b4c41ea2696fa34379e570c7c4ad3bf849e60f441fe88fc516117fb397
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 or trojan variant. It contains numerous embedded URLs pointing to external domains, many of which are part of a link farm designed to obscure the ultimate destination. The presence of these URLs and the link farm heuristic suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=youtube+tuber+apk PDF link annotation
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69749398287.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/piselosaluroweliw.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/49919990503.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/61766368841.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/44562235441.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/vabetokupaxakivigavod.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/zowututigigewaf.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/98337581293.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/merasilezotinaxuwinokovaf.pdfIn PDF document text
    • http://dhf-china.com/d/files/jonudokesiwuwebifuzi.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/polevixukoxinujun.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27525464371.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/33291169133.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/21393328145.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/65804874236.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/xajetumokenumepigu.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/59955452804.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/62994785327.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/63880712029.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/wuzinigivupunul.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/rigisazipubimifividotajij.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141d58cc3ea3---wuzowefibi.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/wokeponobi.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/dikorevajufefobog.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_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 10152 bytes
SHA-256: 500e1f5434acefb1aa7db60770b79362c7119061414650067e505acffd5c46c3
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 18584 bytes
SHA-256: 9f6dd2b8ce13cdf0f06ec61db9d70a674e582a61c1d1dbda2134cab401c96fbc
font_02_sfnt_off00012895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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