Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1058158e1f6dee…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 03:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8264cc7ed924a78a63604f4f3fb92772 SHA-1: 9e8d5bbd98bd7a4fd9781587c269db9125766557 SHA-256: db1058158e1f6dee48f047cd5c315010604006433a2a18b0718ce3ef1f15575b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://peach2560.xyz/js/ckfinder/userfiles/files/32120582259.pdf In PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/nufevotalet.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902045006.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/difokafirasoked.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/tesodiwanotidaj.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/97394339765.pdfIn PDF document text
    • http://djapm.com/userfiles/file/88769621281.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/tijepipawiwir.pdfIn PDF document text
    • https://huanghecables.com/d/files/wagazavozugovutowiboze.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109242253321354.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/jatotaxorudawukasezulij.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/mafeloripejizowukiwaxenu.pdfIn PDF document text
    • http://ccshecea.org/upload/files/5798167495.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/89143918393.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f637fa23366a82e0bf98073b04cf13da/52455238871.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/sizemukide.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c9c948f642d8e297946d497740024839/79588025175.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/terododosisep.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/mabumenadow.pdfIn PDF document text
    • http://njxinbell.com/upload/files/dexujetudojefexisiguxabe.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/fuliroxonasojatokeku.pdfIn PDF document text
    • https://yodobashi-church.com/zajifutixedi.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/37615915303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+tekken+6+for+android+ppssppPDF 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_off0000b260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 10840 bytes
SHA-256: ba4a7142b6fb4bdefe5a486b34b5a56b93a635b160f82dda915788cedf1a8355
font_02_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 15656 bytes
SHA-256: 8b58dd438bcfa146ebd7059dddc50d2c30559afe5f57255d6058e0015c22cc28

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