Malicious PDF — malware analysis report

Static analysis result for SHA-256 5392a0ee6d14a576…

MALICIOUS

PDF

73.1 KB Created: 2021-06-12 15:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a6e765c389c4eee0540197295b3e8f4 SHA-1: 282c2495b7bc64887f6076ec190846fa04819a1a SHA-256: 5392a0ee6d14a576336b388af525850d58fafa67c51da5708fce09c2b68336a9
156 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 maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary external URL, https://catamma.ru/pbw?utm_term=icse+class+10+math+book+solution, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/pbw?utm_term=icse+class+10+math+book+solution
    • https://sowewazapuk.weebly.com/uploads/1/3/4/3/134364424/3924554.pdf
    • https://kuzimedunadaweg.weebly.com/uploads/1/3/5/9/135993385/75f2326.pdf
    • https://budoxaku.weebly.com/uploads/1/3/0/8/130873914/dopunefuroboge.pdf
    • https://maladebo.weebly.com/uploads/1/3/4/3/134305387/1cc454223831d4.pdf
    • https://welabelodaset.weebly.com/uploads/1/3/5/3/135399274/giduz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6bf23138-1a43-4d59-89d4-9d463d667ef9/como_fazer_fruta_desidratada.pdf
    • https://uploads.strikinglycdn.com/files/25fe1671-3dee-4ea2-ac48-3b8cb8b43a87/venubejosege.pdf
    • https://uploads.strikinglycdn.com/files/c6baaf61-db7e-4eac-b3c4-0c464396ae11/88405133852.pdf
    • https://uploads.strikinglycdn.com/files/ba9d7d45-4cb9-4348-881a-e7c56cf89a21/45860433248.pdf
    • https://uploads.strikinglycdn.com/files/df7f38fe-1888-41f0-a477-1dafedf0e28a/mazabimopolixifar.pdf
    • http://xeninexiruvo.pbworks.com/f/sleeping_dogs_iso_file_for_ppsspp.pdf
    • https://uploads.strikinglycdn.com/files/31e0f7c8-b477-471c-958b-d3ae5a7f41c6/dd_3.5_e_monsters.pdf
    • http://tusawijer.pbworks.com/f/92103413417.pdf
    • https://uploads.strikinglycdn.com/files/83612db1-939a-4377-912e-8cfd9aa4d488/safubukokowepi.pdf
    • http://xuruzinijub.pbworks.com/f/25858250845.pdf
    • https://uploads.strikinglycdn.com/files/0970a668-07a2-4906-8759-49680cae2da2/nobafikumatitazeve.pdf
    • https://uploads.strikinglycdn.com/files/d2825675-1cf7-40b0-a7ef-80b89bdd1b35/25881042025.pdf
    • http://tusawijer.pbworks.com/f/kedezojusonolewutidazasag.pdf
    • http://suxogovexig.pbworks.com/w/file/fetch/144895962/16969795598.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_off0000e0b0.bin
2ab51afd13fab5045a52fb768336fa3bf3145d63695f7d2744e35b7d9d786019		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 5280 bytes
font_01_sfnt_off0000f282.bin
1ce1b04b91522d160fb3ffdb378bd8778b3cf3c8e74acacc4ca312eb581e2c03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 10840 bytes

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