Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd477c5a057ac72d…

MALICIOUS

PDF

80.3 KB Created: 2021-03-17 17:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5006c85d22f2a1c45c35be00de1f25f6 SHA-1: 103720f755639ea332e41eb5d7ff81ecc273fc7e SHA-256: fd477c5a057ac72df6c7e715a484826b6ed20941a7d821991936770e2753c58c
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'universal truth religion' and 'wkhtmltopdf', which may be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/strik?utm_term=what+is+universal+truth+religion PDF link annotation
    • http://copyrighthelpbusiness.net/linksys_wrt120n_manualrr5gr.pdfIn PDF document text
    • https://jebigifapiw.weebly.com/uploads/1/3/1/3/131379276/50f60ad92f75b7.pdfIn PDF document text
    • http://tryporte.xyz/zoom_h1_microphone_usb1pzen.pdfIn PDF document text
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/rokoguz-ponikexeruf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_602de35983f2e.pdfIn PDF document text
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/4860266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_6013b7102bc82.pdfIn PDF document text
    • http://thesimplycompleteseries.com/pomafeluboxofiduwojaxuratrm3x.pdfIn PDF document text
    • http://bathforlegs.xyz/zugetapovekugadagomoctc85.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/4663978.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fddb886b02ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_601226313aa83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422659/normal_604f622cb2b7a.pdfIn PDF document text
    • http://karaulovlife.site/hcg_2.0mtv6n.pdfIn PDF document text
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/bumigux_lenudoja.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/d8be0d566f.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/4589050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/b_format_papira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91782fcc-097f-4e7e-9e08-055d5af74f06/in_the_heart_of_the_sea_tom_holland.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/geometry_faces_edges_vertices_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/android-_x86_6._0-_r3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ed53bc-7398-476b-b417-4c73adb68c89/86730987349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9d3f5b-d151-43b0-bba8-344d7b7c7e9b/xerenilijerejo.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/74036390911.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_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 5020 bytes
SHA-256: 90ce60239af3bf69ac42315d72e274a19982adbbc2170e811efbb762acd3b06b
font_01_sfnt_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 10948 bytes
SHA-256: e9c4c147267c78da6b080f3aac71fa27a6cd335a6eebcc46d768022d48cb3684