Malicious PDF — malware analysis report

Static analysis result for SHA-256 7971446dfc8c8b5a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 14:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3dc50d8ad6b136deb6a7a96b8e574490 SHA-1: abcf20d26e7e10ed0e6fc7adf307f0daad50f58b SHA-256: 7971446dfc8c8b5a99bd7084981d7f2a03a9ec78f781b7ca1316af38da8da1ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a large number of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://coretry.ru/uplcv?utm_term=call+app+caller+id PDF link annotation
    • http://ayurvedicclinic.org/userfiles/file/77436572089.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/88514912083.pdfIn PDF document text
    • http://iviltra.lt/images/files/xodegefupilor.pdfIn PDF document text
    • https://adikmanis.com/contents/files/20083022837.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161311fd2d040d---kulimumofix.pdfIn PDF document text
    • http://jsdarvin.com/files/vomajavuseru.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rifevuvojivabugedulajid.pdfIn PDF document text
    • http://sjhtractor.com/d/files/xejedekufomuxuwewebobo.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/49643968128.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/pevabazabeboruvubumak.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/rejunovubowovor.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/40931323387.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/tefezux.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/vezisugapasebogodoseru.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/13562480395.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/82187230782.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/bapurisuzedofopuxuketa.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/logexexuxojeniwikufolib.pdfIn PDF document text
    • https://zhansq.cn/upload/file/rurodolunorejepet.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/wexukav.pdfIn PDF document text
    • https://edusfera.pl/upload/file/36009097672.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/1785809198.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/wujifilupenisewow.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613866ab1b796---nabukevagixurudatovojorik.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_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 17896 bytes
SHA-256: f78574951b71a0b7fe584c401e4d1cb4c1eca62bca30ebc1191443ef9b320783
font_02_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 10048 bytes
SHA-256: 7408855e5bc496fe2b7a601dcc46e5fa5da4dc1c00e8285cfab8a12fc5521b5d

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