Malicious PDF — malware analysis report

Static analysis result for SHA-256 85aaae8eb2618160…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 13:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ca53cdf9e910e8fe937ff5a32e13fcaf SHA-1: 2f7d570af25e85c23ab85ba3594fe9f843f9f74b SHA-256: 85aaae8eb2618160b4ffd0dfc5f8fe5ac84ba0648a5c49e1345ab9da3b087bab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hoalavender.net/upload/files/68723450175.pdf In PDF document text
    • https://dernek.daynexdemo.tk/upload/ckfinder/files/77712987531.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109140336331022.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zedejotuxeveguzelorifi.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/81050583095.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/tadusotonalofegomoro.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/26588010040.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135950049dc4---beviloxisodagam.pdfIn PDF document text
    • http://teplospectr.ru/images/files/bivulawu.pdfIn PDF document text
    • https://austarpharma.com/upload/files/70681290376.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/21243491612.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/98084302180.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/10905779178.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/suvusegodenaluwivovoti.pdfIn PDF document text
    • https://brakos.it/file/nelekewavixewinokad.pdfIn PDF document text
    • https://bloc-immo.com/images/16497499780.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161467138769d3---rifebuj.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/25827548475.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/dupujofizef.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/limokowawufonevivi.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/94091574881.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/zopaz.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/41587016656.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210905214919.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/56108323341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=porn+game+apk+3dPDF 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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 10596 bytes
SHA-256: 4d969841a3c764a30105466057ef3583c761e7e2be6d55d7bcce96e6c01a3576
font_01_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 17116 bytes
SHA-256: 59820b4034f96f66420dee43b6b200f4f5c044585e35c959074ef8e6d04fe8ba

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