Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa63bab707b7b48…

MALICIOUS

PDF

100.2 KB Created: 2021-03-17 02:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 562a0a1365100619dc24f7ef56f5a089 SHA-1: 8ef9808949f313ad9cdbef45b265629f0fccebf3 SHA-256: 8fa63bab707b7b4826e6a7229ae42d477ce2f7981e8a917f86c5ce76e23c53a9
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also returned a high confidence score for maliciousness. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nipisod.ru/strik?utm_term=ralph+waldo+emerson+quotes+laugh+often+love+much PDF link annotation
    • https://pofomagod.weebly.com/uploads/1/3/1/4/131483550/pezewisezutage.pdfIn PDF document text
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/9374950.pdfIn PDF document text
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/1800193.pdfIn PDF document text
    • http://vizit.store/limidazgzmz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_6048c5bb730a4.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/fake_love_piano_sheet_music_easyma3dc.pdfIn PDF document text
    • http://onlajn-kassa.ru/sujosokobasofowazogq8wp8.pdfIn PDF document text
    • http://fruittea.space/16740543407r9qvx.pdfIn PDF document text
    • https://xatotowo.weebly.com/uploads/1/3/2/7/132740458/9052920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_6025a42f88b68.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/54d57.pdfIn PDF document text
    • https://kunolutupevujIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_4e282f6b9c0947d88a24d77e139b87e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5baa406d-fbe2-4c00-9e32-9f9f615091aa/vuxixiter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a8ed2f-c95f-4e63-a76b-bcc3080bb709/zevovifirinejubokinusaj.pdfIn PDF document text
    • http://gajovab.epizy.com/89702061550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6770d8a3-0711-4919-92ba-49939c152d17/6543935278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb7c1b9-be91-412f-8b0a-88c8df4e60e2/biddeford_electric_blanket_auto_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69576f72-c470-4bec-8859-5968204ae681/marlin_336_curly_maple_30-30_winchester_lever.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_14b2d94d756f473984e860d629463acc.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_d41741fc55c24eeba0fe41130ae5fbd4.pdf?index=trueIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_e9da1bdfccef42f48f68969073a1c1b3.pdf?index=trueIn PDF document text
    • http://tinejamuwaki.epizy.com/77428844214.pdfIn PDF document text
    • http://ximitexus.epizy.com/titivixawubaleguzabop.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_off00014743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14743 5856 bytes
SHA-256: ccab761e94e5cb47a5986629f32e187a3a1571a36e5f17a2880f306984c84114
font_01_sfnt_off00015b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1F 11372 bytes
SHA-256: 9a9044733db82e8363a70fa30aa9e323339a4dc88667121a65d6f9d553bf98bf

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