Malicious PDF — malware analysis report

Static analysis result for SHA-256 113a090fc9ef9d98…

MALICIOUS

PDF

74.4 KB Created: 2021-06-01 07:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb04338fe9d433fd941b5858d5073e40 SHA-1: 3519a7ea4dedcbfb37a0cb4592e9fda7ae1b4800 SHA-256: 113a090fc9ef9d98b596f736a15133d0dd1bbdfb77f5cfffd91c7ff35a864b02
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to 30 external URLs. The document body, though heavily corrupted, contains text related to 'Luke Cage season 2 episode guide', suggesting a lure to attract users. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely for SEO spam or to redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=luke+cage+season+2+episode+guide
    • https://cdn-cms.f-static.net/uploads/4498971/normal_602be7adbaba0.pdf
    • https://cdn-cms.f-static.net/uploads/4369774/normal_6044f1e2dd08f.pdf
    • https://static.s123-cdn-static.com/uploads/4425772/normal_60074e3acf2a7.pdf
    • https://cdn-cms.f-static.net/uploads/4481671/normal_602a0d3095cbc.pdf
    • https://cdn-cms.f-static.net/uploads/4457849/normal_60450b4573905.pdf
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/xibomamuvur.pdf
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/petatiropiwurop.pdf
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fd129cda65ab.pdf
    • https://static.s123-cdn-static.com/uploads/4412160/normal_5ffd30760b36c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bofamawetodo.pbworks.com/w/file/fetch/144445038/muxamokugafesotewinif.pdf
    • https://uploads.strikinglycdn.com/files/8d8d90a8-3f57-434b-b850-960ade4d0de5/how_to_calibrate_small_digital_scale.pdf
    • http://vugufosenene.pbworks.com/f/how_to_hack_brothers_in_arms_3_android_without_root.pdf
    • https://uploads.strikinglycdn.com/files/27bae91e-1fdd-4a82-ae42-4ef25eec8fc0/5th_edition_nabh_accreditation_standards_for_hospitals.pdf
    • https://uploads.strikinglycdn.com/files/faeb56be-ef55-4836-8266-5e38710f9b2a/12_times_tables_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/d69c4f28-d8aa-46dc-84e4-b8b8780b7483/5039260387.pdf
    • http://kokoxudalux.pbworks.com/w/file/fetch/144428649/megupasudonozode.pdf
    • https://uploads.strikinglycdn.com/files/2539052e-5254-4df3-b60d-e134ca3161b2/tecnicas_e_instrumentos_de_recoleccion_de_datos_segun_arias.pdf
    • http://zowonixepor.pbworks.com/w/file/fetch/144442575/the_business_of_the_21st_century_book_by_robert_t._kiyosaki.pdf
    • https://uploads.strikinglycdn.com/files/caf13614-a914-4637-9cef-6f044454e5b1/xukagiliwunexuv.pdf
    • https://uploads.strikinglycdn.com/files/202d510e-e325-4b66-927d-9924c62e33b4/85993073727.pdf
    • https://uploads.strikinglycdn.com/files/c974cfb4-9b4b-4427-97f6-56b04e636928/how_to_replace_transmission_solenoids.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_off0000e357.bin
1e84419e9c130b4cd0454914415ad6dbdc6257073258fd53224e1a510a072e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 5252 bytes
font_01_sfnt_off0000f55b.bin
b8905b032228f2a1dba4acfef85f53f02596b2064719d5117a817d800efafef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 10924 bytes

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