Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffafbe65272bc96…

MALICIOUS

PDF

77.5 KB Created: 2021-03-29 15:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0ae7633aa9ad12b27ecf3656dbd2ef67 SHA-1: da27f79714c3ee89932bc49da65eec407f4f1121 SHA-256: 0ffafbe65272bc96ecf9a61aa5aff7bd0b0935c8d40b7f638b1dfe5375da2261
142 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, indicated by heuristics related to fake invoices and download buttons. It contains numerous external URIs, with one pointing to a suspicious domain that is likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/123?utm_term=nonprofit+gift+acknowledgement+letter+template PDF link annotation
    • http://ditasula.iblogger.org/favukemidiwoga.pdfIn PDF document text
    • https://mobasulu.weebly.com/uploads/1/3/0/7/130776822/06628.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/98758674290.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/5005751712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_604d69b37fcc8.pdfIn PDF document text
    • https://guxizipib.weebly.com/uploads/1/3/4/3/134367178/5139777.pdfIn PDF document text
    • https://posofipijetudu.weebly.com/uploads/1/3/1/3/131380531/50d42cb2627baa.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/kuworivubuxadil-padenusetodow-xoleraxuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5fc616a189efb.pdfIn PDF document text
    • https://bisuduroj.weebly.com/uploads/1/3/4/7/134714880/7726707.pdfIn PDF document text
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/13c244d334.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/dikotavigepera.pdfIn PDF document text
    • https://sukigemanewa.weebly.com/uploads/1/3/2/6/132681928/farowato.pdfIn PDF document text
    • http://midimox.getenjoyment.net/xilej.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/expedicion_botanica_resumen.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/fig_code_of_points_mens_gymnastics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://delixerilebuk.epizy.com/disable_auto_format_intellij.pdfIn PDF document text
    • http://kopolug.myartsonline.com/51042602257.pdfIn PDF document text
    • http://gefetela.epizy.com/sezilewe.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/how_to_clean_a_aroma_rice_cooker.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/jadajakoxovibudimigum.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/fosujokezekigagabuma.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/jeladejo.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_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 5420 bytes
SHA-256: 4010c748255f35b1107cbf4815f48b138f66877cbea090f9647f8500987f707d
font_01_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 10272 bytes
SHA-256: 444300ed5401ea7d6aaa64b39dac82a8f1e2f774e82aa9ead7ed2154b7b779e6