Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0915db1729663d…

MALICIOUS

PDF

79.2 KB Created: 2021-03-11 14:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2c2f2dac32f3459559095baee7019a4f SHA-1: 00ef6c9505c6ba45dd2016c185df4563c1833622 SHA-256: 1a0915db1729663d49ea6e1162fbd5db1765debb2050b9d901b1bf8ced6394e0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting it's part of a link farm designed to drive traffic to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary lure being related to "willy wonka slot machine cheats". No scripts were extracted, but the structure and embedded URLs point towards a phishing or traffic-generation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/wix?keyword=willy+wonka+slot+machine+cheats PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382643/normal_5fcae865547d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_6024bda63ed4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6038b42577381.pdfIn PDF document text
    • http://love-cosmetics.shop/english_to_spanish_audio_translation_app_for_androido4k54.pdfIn PDF document text
    • http://afracheat1.xyz/canon_mg3520_driver_windows_xp8pt9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505363/normal_60354e3e531e4.pdfIn PDF document text
    • http://xikibokukubis.iblogger.org/lamifizid.pdfIn PDF document text
    • http://afracheat8.xyz/2357400899miqu5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_6019b002b701c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_5fe3efe3da60e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_6049c5e37b683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5fd9391aa276e.pdfIn PDF document text
    • http://didavixakodix.22web.org/guideline_401k_address.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/onn_rf_wireless_keyboard_not_workingu4odz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374708/normal_6007c64b2fa51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_bc100b7451e745b491a4d87a90874582.pdf?index=trueIn PDF document text
    • http://vurasoda.rf.gd/top_10_android_box_2019.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_2332dcb5ba0a4ef8bc28f81e8bb56ce6.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_b68539ce9b98469eb758da09a601e96e.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_c5983cea1b4d44328520033dd9313342.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a9207db3a5544ffd990ec6c9f627d97b.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_96119d17948a4a7b98a3ab6ab2441534.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_7e05600a921a41d0874589cda6220d1e.pdf?index=trueIn PDF document text
    • http://remoloki.epizy.com/pavapenizagogugajinu.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_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 5212 bytes
SHA-256: acec556d633d6472d5a7c5af4266411a799a3cafcaff8582c440a63781070449
font_01_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 10828 bytes
SHA-256: 0755ae46ae47d9250ed4950478a139cae47af4a99c95a386bef2f2ff0fc016ff