Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c97eba6f1097ea…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 00:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a81e26f87296d578785b9be39a9136a SHA-1: 6e72cec37bea00e6295465821a7b618eee2be95f SHA-256: 77c97eba6f1097eafbc4ce8ac53922c62df827da750a30725ea51e7d3beb789d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The presence of the 'utm_term=roblox+robux+hack+script' in one URL suggests a lure related to gaming exploits, potentially for credential theft or to trick users into downloading further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's used for phishing or malware distribution.

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 http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/27100364756.pdf In PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/53311677387.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16314804430836a198b6174eecf02c.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109031650375850.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210907151641.pdfIn PDF document text
    • http://ingore.cn/upload/files/43784098660.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/33097818257.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/vajaluzexanuvepunapur.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/42585610268.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/92421217898.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630985188.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/rexunejinusivatimo.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/46067205515.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/2745029746.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/boledivusoreza.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090608350873499.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/notasutedenujemi.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/3361429867.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/nuwetofiwegurajisisofo.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/56334957303.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/jefebunimolexoduvasivusim.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0fc0c48e2---rovidowolitedowe.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/68369271004.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/kifejolo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/74055119628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=roblox+robux+hack+scriptPDF 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_off0000d5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 10712 bytes
SHA-256: 0a1f1a7b76a49e7c8c2d8bca5ed9371a5704bb4e431bd96ec79cdeb25140417b
font_02_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 17816 bytes
SHA-256: d59a32fb3343e39ffdfb5cc48a044b37893950b96fe90ec4d907f9a7c52016f2