Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a5aaf1350b159b…

MALICIOUS

PDF

87.8 KB Created: 2021-03-09 04:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e65675421c7426c3bd61d555826f8bf SHA-1: 54d7b4caf35e5a4105554022da2d670cfcc06150 SHA-256: b3a5aaf1350b159b0f4c934648ea132672176bdd1ec41af92667857df4c86447
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains heuristics indicating it is a phishing lure, specifically mentioning invoice or payment language. It embeds an external URI pointing to 'resalured.ru', which is highly suspicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://resalured.ru/award?keyword=union+budget+highlights+2020+20+pdf
    • https://forinuvu.weebly.com/uploads/1/3/4/8/134871535/5a4df8904a3740d.pdf
    • http://good-production11.site/estadistica_basica_en_administracion_berenson_levine93b9e.pdf
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fcb06e543de2.pdf
    • https://cdn-cms.f-static.net/uploads/4491148/normal_6022f5601da62.pdf
    • https://cdn-cms.f-static.net/uploads/4481067/normal_603aa51278518.pdf
    • https://static.s123-cdn-static.com/uploads/4401732/normal_5fee8bfe9d894.pdf
    • https://xoxitugupara.weebly.com/uploads/1/3/1/3/131383959/6690869.pdf
    • https://xaxexuwolak.weebly.com/uploads/1/3/5/9/135978614/fakefenog.pdf
    • http://sanatoriy-izumrudny.ru/ciara_ft_bow_wow_like_youzhsc4.pdf
    • https://cdn.sqhk.co/lijipatalenu/Yfjegcq/mumafafanurumusavadabopu.pdf
    • http://jisipajimeleja.22web.org/zolobokinit.pdf
    • https://konizalo.weebly.com/uploads/1/3/5/3/135388679/757fefb9.pdf
    • http://akmurzina.com/what_are_the_different_types_of_iphone_86lprd.pdf
    • https://cdn.sqhk.co/wexifidobafo/sifgdhg/human_resource_management_online_degree_programs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://desuvusemexemob.epizy.com/88974066971.pdf
    • https://uploads.strikinglycdn.com/files/bc4aea53-0882-4148-8312-71b67f7bc703/zozirogedikijoz.pdf
    • https://uploads.strikinglycdn.com/files/ff8b6011-1d10-4d54-a8d3-a02364581bd4/bonasobidokuxijusinadixo.pdf
    • https://uploads.strikinglycdn.com/files/79b644fd-e1f0-478a-9251-75a32934681a/garrett_hardin_tragedy_of_the_commons.pdf
    • http://zirexig.epizy.com/lawabafojekowekinuwafol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d06.bin
360485dec90816627fdad88434920874303d58143a301a22281ca019d028e538
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 5404 bytes
font_01_sfnt_off00012f6a.bin
18babc5a43d677dc6cdf2e9fa51bd59d0782c3e262d217ded7ddbafb0efd4e5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 10192 bytes