Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3d64cc5bd6fe43…

MALICIOUS

PDF

80.5 KB Created: 2021-01-20 15:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 17c93d5fec79071e896f0949d9d1a8d5 SHA-1: 9d9b8a313fc832720d2439135c27009b549dd007 SHA-256: 2c3d64cc5bd6fe436c69de4f7bbeb74c93c45ba80827742f17b9a97a1666b2bc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a critical heuristic identifying links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'The captive prince trilogy' and 'wkhtmltopdf', suggesting a lure document. The presence of a link farm on disposable hosting further supports a phishing or malware distribution intent.

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
  • 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://traffmen.ru/123?utm_term=the+captive+prince+trilogy In PDF document text
    • https://cdn.sqhk.co/lafuwexale/mfhgfP1/hindu_calendar_2020.pdfIn PDF document text
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/4067428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5f95a5c3d2faf.pdfIn PDF document text
    • https://cdn.sqhk.co/mepawoworu/EwUjjcM/29467640818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5fd934a981981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456420/normal_5fe450fe1cd04.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/fidafuviguvufot_lovalagupuzo.pdfIn PDF document text
    • https://lisopivoxo.weebly.com/uploads/1/3/4/9/134901835/4481804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5f928ad109bf7.pdfIn PDF document text
    • http://kegujusotuk.iblogger.org/ribifiko.pdfIn PDF document text
    • http://vijoxufomodazug.22web.org/wasovarovef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusunikumejimet.rf.gd/13741819343.pdfIn PDF document text
    • http://jazupizewatabal.epizy.com/71360545202.pdfIn PDF document text
    • http://lamafuravufezin.epizy.com/arnold_chiari_malformation_adalah.pdfIn PDF document text
    • http://gefetela.epizy.com/fluvial_erosional_landforms_in_deserts.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/35175834997.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 5128 bytes
SHA-256: c7e9b9ed8b7f9bd6a5d80f41518a2154a8af5212da6a776631ef28ff991c9fb4
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 11156 bytes
SHA-256: a361c496c8a754c0b7674f57b5783a16e5bcafb091424239c70d64c19e072557
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 16144 bytes
SHA-256: 8164b3083dbc10d302236c85d4902a3bb1399755f1b7623f6d0011557f3e8ead

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