Malicious PDF — malware analysis report

Static analysis result for SHA-256 935855321a9d82bf…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 01:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b43c6431d645b8b07d06ebcbad44a6ce SHA-1: ecf9683abef75741d23296d3a6e1334c84896f42 SHA-256: 935855321a9d82bfb98dd34c84bc64f7f9d9063da7fe2c838f05c3723dea9310
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://loca-granderoue-montaletang.com/ckfinder/userfiles/files/68535507446.pdf In PDF document text
    • http://myblindz.com/fck_user_files/file/45316727354.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/58586067467.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210906_124936.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee272883a---febonekop.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/jimixikoxusofurar.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/dagumibu.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/fugovodigikibavumu.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/76859880725.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/xugepodomirag.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/27653219363.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/37377123322.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/napareroxijisi.pdfIn PDF document text
    • http://rilta.net/userfiles/files/88132237393.pdfIn PDF document text
    • https://bunianco.com/other_files/File/53280362730.pdfIn PDF document text
    • http://clerus.hu/files/file/37567516756.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///42408376363.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/61156206175.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/sezudusalasiwuvam.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/gadovanomobimanawobo.pdfIn PDF document text
    • https://qkon.ca/images/file/90132351521.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/kufijini.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/luwejujogameguzazalebun.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/velivol.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4ru2nj36uk8toul3mvj6nkg44i/98998289730.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/rodod.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/selesijimujunafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+transfer+file+from+usb+to+mobilePDF 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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 18172 bytes
SHA-256: af17101402f1bab4844b6c5a60cc1e49718a91e457f57889d7dbbc9636b1a50d
font_01_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 10692 bytes
SHA-256: 9342f2fa95670492422fafbc06eda550c16e7aad5ac81b2e96b632f9eee2e492
font_02_sfnt_off00012bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1