Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f1bdaf357227ec…

MALICIOUS

PDF

87.0 KB Created: 2021-03-17 05:12:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0411a4848d5db84d05902ad701db52b8 SHA-1: 2b9066efbbaa93ece75e22351563b3a329dd295f SHA-256: 05f1bdaf357227eca9889a4255ee4752b33cdfc5aa8ed5f7f9d56a3cb1c9d36f
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://vilenefex.ru/wix?keyword=ap+statistics+test+7c+answers', indicates a lure to attract users searching for specific test answers. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=ap+statistics+test+7c+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379959/normal_5fe8629e69a36.pdfIn PDF document text
    • http://bukudix.getenjoyment.net/gipemidug.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/rozedejid-bifebawujar-valisejefaxani-vekovu.pdfIn PDF document text
    • https://xuvaguwofivopi.weebly.com/uploads/1/3/4/4/134463587/guwejadilisan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417999/normal_60011e741a8a5.pdfIn PDF document text
    • http://kofojoxake.mygamesonline.org/18335124115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_5fd7d95758c68.pdfIn PDF document text
    • http://tugokutuli.scienceontheweb.net/91313455333.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/basic_access_database_tutorial.pdfIn PDF document text
    • https://folozulo.weebly.com/uploads/1/3/5/3/135351090/japojodixesarixepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368740/normal_5ffe17a826f03.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/vowezokevedorexamu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393647/normal_5ff903cf7d601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482882/normal_5fc5be8b90c11.pdfIn PDF document text
    • http://lerimofo.mywebcommunity.org/ahron_bregman.pdfIn PDF document text
    • http://konolux.medianewsonline.com/simple_visual_basic_6.0_programs_examples.pdfIn PDF document text
    • http://sinoxaju.mygamesonline.org/centerpoint_air_rifle_scope_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5ffb16eb8c850.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/cub_cadet_lt1050_deck_belt_keeps_coming_off.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5fe28551f39c3.pdfIn PDF document text
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/dizawovug_junosadelivo_robibe_wizorituluj.pdfIn PDF document text
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/xikarenubudovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_601bfa9523e5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_b30addf2d43446f79db30e5139a8affe.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_3dc9dbb72570459a87ac2930541483a3.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_a58907f97e96479cbe5a3ef9b3a0826f.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_50246ba44a25411eb0ca904f2e9553df.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_372f7806fd304d1e84623f0a268bd4e3.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
    • 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_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 5056 bytes
SHA-256: f9de9a182edd9a5fa0f6a576ebf95e7d4c7601bc0630e55f06282467928a92fc
font_01_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 11680 bytes
SHA-256: ce259bd4667c3bf87609ad397fb4aa250b09dbf13485af6709fc2ff69159f04d
font_02_sfnt_off000137b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B3 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17

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