Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3a7c2621b1c37b…

MALICIOUS

PDF

75.4 KB Created: 2021-03-09 01:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c285e42d59f7e100d82dc246fc2a90ea SHA-1: db60a4241669028ab68dbe9b621144c6f822feb9 SHA-256: bf3a7c2621b1c37b76f926ee1ebf81828b7eb46e5aa8e8b7ae2134a832167f95
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The document contains numerous embedded URLs pointing to external websites, many of which appear to be part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest an attempt to redirect the user to malicious content.

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
  • 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://kuzutuzo.ru/award?keyword=accelerometer+adxl335+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368969/normal_5fe2330f73c67.pdfIn PDF document text
    • http://puwexakibo.iblogger.org/banjara_video_song_number_padal_ing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_6017a559b39eb.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/tukosuxejer.pdfIn PDF document text
    • http://rigares.iblogger.org/6136803834.pdfIn PDF document text
    • https://zuxivojeduzudog.weebly.com/uploads/1/3/1/3/131381782/vawabip_xigogudod.pdfIn PDF document text
    • https://kulilopoxi.weebly.com/uploads/1/3/4/3/134375859/2367754.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/free_able_blank_calendar_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_60180e706ca4e.pdfIn PDF document text
    • https://duvujisukodat.weebly.com/uploads/1/3/4/6/134674851/1388983.pdfIn PDF document text
    • http://sijojovimem.22web.org/mogibapolajuzaxajid.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/hdaD8IR/best_ar_effect_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vumajotiwog/hfhghiW/remote_control_car_helicopter_drone.pdfIn PDF document text
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/xafizujiji.pdfIn PDF document text
    • https://janilunulosuga.weebly.com/uploads/1/3/0/7/130739392/rixogefonul.pdfIn PDF document text
    • https://wosabizovores.weebly.com/uploads/1/3/4/5/134577485/vijegoxolim_fipunatepi_somixowugotiben.pdfIn PDF document text
    • https://munuliwakubife.weebly.com/uploads/1/3/1/6/131637312/maxelabap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487897/normal_5fd8b0895adfd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujodobiwug.rf.gd/maplestory_ludi_pq_guide.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 5468 bytes
SHA-256: e6d139982ceb7d6112d33d1187ea8766c5d75c76ab5a3c4c46f107cffd291eba
font_01_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 10512 bytes
SHA-256: e6f83b46ae177c935cab89001806db092d2b0898cb68b30a4566a00e5a53fef4

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