Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab0ba8198f83f50…

MALICIOUS

PDF

90.8 KB Created: 2021-04-02 13:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 004864a0a1e93ca32f302d61fde77af7 SHA-1: 49383535f0afaad23a817bf3d81afacc72fa9f72 SHA-256: 9ab0ba8198f83f501976cece5d15bc800cb39e7f34d264505d40c9762899acf5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with one specifically pointing to a potentially malicious domain. The document's structure and content suggest it's designed to redirect users to external sites, possibly for phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=unidad+3+etapa+1+actividades+para+todos+answers PDF link annotation
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/finunum-pirad-najelokomuzuv.pdfIn PDF document text
    • http://nadugavuwitaleb.iblogger.org/zerodha_varsity_module_9.pdfIn PDF document text
    • https://dizuvojuxi.weebly.com/uploads/1/3/1/1/131163617/miwejevenudimudodi.pdfIn PDF document text
    • https://zanudega.weebly.com/uploads/1/3/1/1/131164011/8724588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_600e520d89693.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/7020827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_60445f1ed908b.pdfIn PDF document text
    • https://davanowaxisipu.weebly.com/uploads/1/3/5/3/135318110/worobitovena-vuwebuj.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/njgiAbR/fuel_up_to_win_2019_game_board.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/JiiyrAH/67141734046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_5febb609952e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d408c23-d85a-41ae-98b8-315ba7ff6714/visawipofujozuwokir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df941e0-e01a-4e82-8a63-efd9817ae84d/ariens_824_snowblower_repair_manual.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_1e90aa7cfce040fea87ec66747c6c1c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebe44bb-7bb1-450b-9447-a3913197d693/jebimopenuzix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592b3c11-2080-41c7-b6ca-7951ceff8a1f/9160265806.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_2173c4114d2a4172922233b44e4cee59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ebd6ae-d2b5-481f-9bdb-4e71095ca356/a_canticle_for_leibowitz_chapter_1_summary.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_486e1b487ce4454bbbe088e0d6f3c4a5.pdf?index=trueIn PDF document text
    • http://fivasire.rf.gd/4742310098.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_66656615d55749d38107a080053e878c.pdf?index=trueIn PDF document text
    • http://luwutijawalokug.rf.gd/2276132114.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_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 5396 bytes
SHA-256: 1b5324d68c94003fc54e536a7e7eb4b5cfe4fa10a4560ad804c6087ae4a24642
font_01_sfnt_off00013226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13226 12412 bytes
SHA-256: b84d58cc0e4efa51e6bdd92f8af678b9db80eb8039f5a4dda7429b59a4380820