Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c13655d0c71341…

MALICIOUS

PDF

75.7 KB Created: 2021-04-17 07:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eb1f56402408a053169d040eaff989d6 SHA-1: c959e5b574a9d5be3d9b5d08fc4ae9fc6cf7ddca SHA-256: c0c13655d0c713413f8a2902c004a3b7548a7d136d251ccaebb8483c40a46d2b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain text related to the embedded links, suggesting a lure to trick users into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=can+you+rekey+a+schlage+sense+lock In PDF document text
    • http://lupobel.22web.org/99763471835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529149/normal_5fec4f3ba0240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_601ab99be0525.pdfIn PDF document text
    • http://gisowutuxa.22web.org/combinatorial_commutative_algebra.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_6018e8482bea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_6059a3add93f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_605904f05e5a9.pdfIn PDF document text
    • http://givepamodugag.22web.org/gufefivinit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_600c8dad3e623.pdfIn PDF document text
    • http://nujerizura.iblogger.org/wutisekuvupunulos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vanuragevexofe.rf.gd/is_honeywell_humidifier_good.pdfIn PDF document text
    • http://tosefiwaniw.rf.gd/selogumujowapave.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/13144167536.pdfIn PDF document text
    • http://galefawanakujum.rf.gd/7687009140.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/gapududonediw.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/capture_one_pro_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/mouse_sander_sheets_screwfix.pdfIn PDF document text
    • http://pepiretivixu.epizy.com/romeo_and_juliet_movie_online_leonardo_dicaprio.pdfIn PDF document text
    • http://lizudavidigem.epizy.com/python_2._7._6.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/xuputakazegulufegeduge.pdfIn PDF document text
    • http://labazorev.rf.gd/80266605056.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 5004 bytes
SHA-256: 8ac44e85c3dbf8a9f02df1ae3f9b7c0390eb590805b9baa4aeefceb477575202
font_01_sfnt_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 10700 bytes
SHA-256: 621bfb553268b8b43556b0f17a34ca790a9b9230562c9b4699f9d72323d0a027
font_02_sfnt_off000111cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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