Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d539ad0d1aef0f0…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 21:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d6a56d9be7089efc8e386b16cfd6bb3 SHA-1: 2ae86242f436188d1566e837764f71824ef817b0 SHA-256: 5d539ad0d1aef0f0a86f9310821516d7900fbd2b4da409f734723ac6a9adfcc6
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 trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. One prominent URL, though marked as benign, is presented in a context that suggests it's a lure for downloading an APK, indicating a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://geoass.eu/userfiles/files/medoku.pdf In PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/zekizuluronuwovuroliz.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/53917722674.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210927181545.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/12784490624.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/696664677.pdfIn PDF document text
    • http://cloverdiamond.com/file/jewenepufe.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/46554679772.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/bovavuseru.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/zazematukigifenatasa.pdfIn PDF document text
    • https://unosms.us/userfiles/file/13291462821.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/pebotefobefikewuwel.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/16042996474.pdfIn PDF document text
    • http://momsystem.ru/public/file/89706485489.pdfIn PDF document text
    • https://fptica.ru/images/file/lobupafare.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/47275858840.pdfIn PDF document text
    • https://melz-feu.ru/upload/novugireno.pdfIn PDF document text
    • http://momsystem.ru/public/file/24825207990.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/50814346817.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/71213074743.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/29539266708.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/karifakalipiped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mobile+legends+next+project+apk+downloadPDF 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_off0000ae57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 15656 bytes
SHA-256: 06da662f32b0b8fee96f918c240a074b64a328c8817573fa6988fbae3bd8cf88
font_02_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 11232 bytes
SHA-256: 4f193f1cfd5df6c67c25d2858d47fa84891338f78d0e2c3361b1631278f1cc26

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