Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3866110c321da1…

MALICIOUS

PDF

90.4 KB Created: 2021-03-11 02:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e20210af5ad7c74bb33a2715d073902a SHA-1: ceb2b53970d18a1c8f91cb5b66bbf3ba2f5e2106 SHA-256: ee3866110c321da19a271100d06cae7b1edf37a2e1eda3d195a9900c3cfb9f94
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://resalured.ru/award?keyword=teoria+literaria+alfonso+reyes+pdf' and 'http://garant-ritual.online/120389918284f168.pdf', are likely used to redirect users to phishing sites or download further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for malicious PDF creation.

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
  • 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://resalured.ru/award?keyword=teoria+literaria+alfonso+reyes+pdf PDF link annotation
    • http://garant-ritual.online/120389918284f168.pdfIn PDF document text
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/25a928507425.pdfIn PDF document text
    • http://bitjoms.xyz/the_hunger_games_mockingjay_part_2_pinl67r1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419001/normal_5ffa836e25f17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380209/normal_602feeea37edd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_6011a97ad30fb.pdfIn PDF document text
    • https://laxopewivizi.weebly.com/uploads/1/3/5/3/135394850/suguwemonetonatago.pdfIn PDF document text
    • https://vifawadezak.weebly.com/uploads/1/3/4/8/134846548/gopizefeda.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/already_home_a_great_big_world_piano_sheet_music.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/nutewiwazop.pdfIn PDF document text
    • https://buxomajuse.weebly.com/uploads/1/3/4/5/134588570/2108e9a060f65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_60009fcc2731f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5fcd31d58ecf4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwutexo.onlinewebshop.net/ars_notoria_game.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/aasl_standards_framework.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_8e68bacbe4ba4888933ea444891be647.pdf?index=trueIn PDF document text
    • http://kakasis.onlinewebshop.net/zefakoligaretagovamamaxe.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/rocket_stove_combustion_chamber_design.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_123240bb97e94eac8ef0f7aac9a69764.pdf?index=trueIn 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_off000126e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E4 5088 bytes
SHA-256: 76ced7739fdfaa2174b2497d066ac18bc41ef96aad4857533dc072df10538060
font_01_sfnt_off00013849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13849 10536 bytes
SHA-256: cbb69b33c8482f29b36b509cd623b4decb323fb94c8e11759907c48c19631cff

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