Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72a63d6ce1ac428…

MALICIOUS

PDF

93.0 KB Created: 2021-03-01 15:16:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d0d2339a7f08d2e9c16184c9e607895b SHA-1: afa040499a102fdc2a81c450fe5e41c6e7440ca0 SHA-256: f72a63d6ce1ac428c596681afeae22e1b2aa006afc4713c3a99122f7bf2a6d9d
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure strongly suggest an attempt to exploit users through deceptive content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://soxebez.ru/wix?keyword=construction+management+jumpstart+pdf+download PDF link annotation
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/lirusegedegasud.pdfIn PDF document text
    • http://jikonuja.22web.org/sharp_atomic_wall_clock_manual_spc900.pdfIn PDF document text
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/nodovojajev.pdfIn PDF document text
    • http://allieshouseofhope.com/libesonafoduzasiputufovux4zlhq.pdfIn PDF document text
    • http://erogan-encolumbia.site/96834367354iiny5.pdfIn PDF document text
    • http://nofomox.22web.org/free_skype_video_call_for_laptop.pdfIn PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/fb02161.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/haXhbjh/hungry_shark_world_megalodon_message_in_a_bottle.pdfIn PDF document text
    • http://item-mask.top/nesasi2t08x.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/DGgiiEj/79819393172.pdfIn PDF document text
    • https://lokevevivepino.weebly.com/uploads/1/3/4/1/134131736/9d50c65dfe.pdfIn PDF document text
    • http://saudiautoinsurance.com/niwoporinigazza9f1.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/d966d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rejosunugewojif.epizy.com/73553960414.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/theory_of_catastrophism_and_uniformitarianism.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/application_form_for_schengen_visa_vfs.pdfIn PDF document text
    • http://giratas.epizy.com/tanaman_binahong.pdfIn PDF document text
    • http://pefijolal.rf.gd/68400593527.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_off00012e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E00 5548 bytes
SHA-256: 6e2370811350549f2f1f3a195b3e5519ecfb2e86ddd34dbc5a98e1268bc53146
font_01_sfnt_off000140d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D9 10884 bytes
SHA-256: 84b28c3150597a5d343ae267c913eaf5296a8d90ed2b356c3c78df3d7322bf76

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