Malicious PDF — malware analysis report

Static analysis result for SHA-256 14422e73a3d28b82…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 03:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4dc385ad6829c4ab2bd0c807ab8a6af4 SHA-1: 2066df16e171a2e6ae02a82858b91354b263d2da SHA-256: 14422e73a3d28b82bd1354104a1e3d05c134af176ef7324edb258594071dba82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://appartementslisa.it/an3_Uploads/file/tumowurotefezof.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306fb4a7896---59260336420.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/45569267222.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/16515299460.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/bilapeviwedemuve.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210906061548.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/93711324765.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/6677313736.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/82863049407.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/85062617546.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/19723332820.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/wugujixemofasuwaruso.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/jojumawawokuzarolixiwe.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902030151.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/21502261722.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/89174706180.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/fumizasemanuxoj.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/velatugofunigizawopuvopu.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/45305988419.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/sufipusimelaso.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/naxopelabimujunufebi.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/lisigajazexatav.pdfIn PDF document text
    • http://signauction.net/userfiles/file/71891286831.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/nifewowuxulime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+trade+on+anime+fighting+simulatorPDF 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_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 10976 bytes
SHA-256: 75a0ac0527eb5aa14b81856218f6622ed8d3cd984874e8c7e1dd8e12d2335f58
font_01_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 19224 bytes
SHA-256: 59c0dc7d5b94b4a8a644013822c4fe86c489bd02083213498720da441e980455

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