Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcb1d93360d1e2f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 15:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8535ba052b57f89a46002c0c0496de4a SHA-1: 847b026989fd0b82929cadc4499f0d3a5b671392 SHA-256: 8fcb1d93360d1e2f1214c9a2ee3bd22935055ef46466f64cfbdbd3c5d561e3d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by both ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous distinct hosts and a UTM parameter suggesting a lure for 'nintendo 3ds apk'. The embedded URLs point to various PDF files hosted on potentially compromised or disposable domains, reinforcing the phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://studioscoponi.eu/userfiles/files/burepe.pdf In PDF document text
    • http://studiotecnicolari.it/userfiles/files/jutipubo.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/degakuxezibutipu.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/8541047259.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gipivakimexupi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/gfqel7ke0i5l4j64o768iimfj0/gazok.pdfIn PDF document text
    • http://yoron.net/up/files/97373337670.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/wamenekuneba.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/suha20c56vng9u7b2gp68pfmd0/venodidusalepovimoso.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/gevipapuwuruwutudufowu.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/tewobuwafaruvokesotop.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/jopunadase.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/17868757727.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/28949096739.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/84988435468.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/torividiwenidifivugawenuj.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/diburoxozisegubori.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/gufesowufolanemiwobokigo.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/42224876101.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/85597340103.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lisojimirobabilak.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/karaj.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/19952911488.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/22021202826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=nintendo+3ds+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6B 10480 bytes
SHA-256: b4f85f6fc94c81c3080c05aa572af6316ba5c33bc867f24541e7797eec636d6e
font_01_sfnt_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 23600 bytes
SHA-256: ce0b409f28c88c3c1c0f288b0dac6a934c0b07a950f4583c7241da02255ed742
font_02_sfnt_off0001130a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729