Malicious PDF — malware analysis report

Static analysis result for SHA-256 265279dd96490a88…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 09:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31bc632db2891a049e47f58eb571b827 SHA-1: 215d426203d1d6273110c7b048a47c6bfbd422db SHA-256: 265279dd96490a887a38171474b4315d7d16ee963de5b8ecf4cbc8692f6f65c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on disposable domains. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wedding-photos.cz/userfiles/file/34941226816.pdf In PDF document text
    • http://puisan.ru/uploads/file/zubesoboguvabegi.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/78916407691.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jd47at0fejaui9i9mlfmpomk2h/xujegipagive.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/511824304.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905041153295.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4cc379eb---kekobizazisibunalopo.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/41842393972.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/56864420237.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/644e44f4eb6e26555d1725a93b3841be/24773261899.pdfIn PDF document text
    • http://healthywithhart.com/res/file/zulubakesiwogikuponazekiz.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/82717759452.pdfIn PDF document text
    • http://airmon.hu/images/files/wewoxugokedutumix.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/2392037582.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/24156373810.pdfIn PDF document text
    • https://denimder.org/resimler/files/laxilufevejiduwoji.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/61657338513.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210912_49E2A4611A770568.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/daxonat.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/nabufusetulul.pdfIn PDF document text
    • http://tipiland.net/upload/file/19558070809.pdfIn PDF document text
    • http://etkenkalip.com/files/mijeton.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/rokodepozuxizomixidawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=car+parking+games+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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 17972 bytes
SHA-256: fb9fd99ba6e4bc2c8c8d2660658feb29b18bf66043e9c91d05255c433e8848ff
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 10764 bytes
SHA-256: 96185431df8d8163b92fe47eb63d45e620ea240adb4bdce57cd4842b29042244
font_02_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1