Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ee6e1f0d7c3574…

MALICIOUS

PDF

95.0 KB Created: 2021-03-19 21:14:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3b90c7c3109effd0d8b3f7116bbcec71 SHA-1: 346330d617f91d0ee17890c325e2f50bec65b21d SHA-256: d1ee6e1f0d7c3574ca2ced6350d476a33edacdac815cd3e2e1d0fbb721961040
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment, likely leading to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=no+gcc+man+page PDF link annotation
    • http://nejoxulogawa.22web.org/16249894418.pdfIn PDF document text
    • http://world-wildshop.com/471089345571jcw9.pdfIn PDF document text
    • http://petersikdar.com/ace_english_book_by_adda_247_downloadnimbr.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/great_book_of_tattoo_designs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fd1bad875b69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_604b30b5d19dc.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/7.3_automatic_transmission_fluid_capacity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456660/normal_60314f5f569ef.pdfIn PDF document text
    • http://tevfikyuce.xyz/14653680421hd28a.pdfIn PDF document text
    • http://reduslimitalia-official.website/ways_of_seeing_berger_bookpx0ds.pdfIn PDF document text
    • http://hellesypakk.online/pifunufamuximemokifolimbd9r4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5ffd507b63d4d.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/how_can_you_pay_for_a_rental_car.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tevisub.rf.gd/incremental_sheet_forming_ppt.pdfIn PDF document text
    • http://tabifewegijip.epizy.com/98488981329.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_d114ccc652e84fdabbe9b6c7427425db.pdf?index=trueIn PDF document text
    • http://vorofij.epizy.com/melhor_curso_de_ingles_online_gratis_2019.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_87524500e7a54f92acb680e6037cf4f9.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_92c118fb9693471eb84de3dcc76e2588.pdf?index=trueIn PDF document text
    • http://dadojusox.epizy.com/16951704981.pdfIn PDF document text
    • http://rewerikipij.rf.gd/pifokopamutefagi.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_off0001348a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348A 4916 bytes
SHA-256: 567e35352622d381a1eedb360478769cb84aac6c9e43d49bc94e8317f82c684c
font_01_sfnt_off00014544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14544 11928 bytes
SHA-256: 05226cbffabbdbe5f7c929666af5f3252ad26857e5b33dfab7b90c4b0f97f8d5

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