Malicious PDF — malware analysis report

Static analysis result for SHA-256 346ad48e1572871b…

MALICIOUS

PDF

81.2 KB Created: 2021-04-15 07:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9d334cdffc5a7729493ab4abcaf1809b SHA-1: e1677ba555db622bdcda7e6e1491c0f54f19db51 SHA-256: 346ad48e1572871b88091d69b702d3bd31bf3fd7df6c614f2446f3ce52ecc53f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious or SEO-manipulative content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://zajinet.ru/strik?utm_term=reading+skills+worksheets+pdf PDF link annotation
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/mumivajip.pdfIn PDF document text
    • https://leludexubivavij.weebly.com/uploads/1/3/1/8/131860378/nibevajarig.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/8507220.pdfIn PDF document text
    • http://sewalenugebob.iblogger.org/fraser_hart_ring_size_guide.pdfIn PDF document text
    • https://fupamivalid.weebly.com/uploads/1/3/4/3/134306001/womilogene-norenimis.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/nikiwefad.pdfIn PDF document text
    • https://varepanuror.weebly.com/uploads/1/3/5/3/135394497/lobedugud.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/79041842311.pdfIn PDF document text
    • http://nugowimabu.mywebcommunity.org/calculista_de_estructuras_simon_goldenhorn.pdfIn PDF document text
    • http://xubajur.mygamesonline.org/zefifere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sazurufupamaxa.myartsonline.com/neoplasia_pathology_mcqs.pdfIn PDF document text
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_c6b75ad15381487880603e32bc15a873.pdf?index=trueIn PDF document text
    • http://daboloxasorun.rf.gd/autobahnkarte_schweiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd65741d-dfe5-42cb-beef-bc6ac42d53a6/understanding_financial_statements_11th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff97d232-767f-4071-bd2d-1e56713d12a1/pioneer_dxt-2369ub_specs.pdfIn PDF document text
    • http://zilemugas.epizy.com/xanilenexuletinigij.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_b23602336fad49cebcf297c202e7c329.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/55927634849.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_18672146d4af431982a8ec53285b4198.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/utorrent_pro_android_incoming_port.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/97654444204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec94ec2-1604-4be0-809f-77ad82a7d573/how_do_i_connect_my_hp_deskjet_2542_wireless_to_my_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a8a9de-5a61-4d2e-9eca-f9429bd86719/american_gods_season_1_episode_1.pdfIn PDF document text
    • https://4fd7ac12-06e8-439c-96a9-7636004ccb32.filesusr.com/ugd/9554ab_92afe9d6ec0d42c3a1e47a90fccb626b.pdf?index=trueIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_6130181bd8094c32bd4f05e42622fbe7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/037719b4-d3a9-4df3-9b7f-c873a1032bda/how_do_you_write_an_introduction_for_a_research_paper.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 5252 bytes
SHA-256: d673bb688e939d8ba31bf377dac6e1198a825b7d98eb59f1e41e9a374a6ef13e
font_01_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 10624 bytes
SHA-256: 371289fb5e897e41b0064faef0f7d1f2e12290c51afb8f7ac95b3d6b5184be11
font_02_sfnt_off0001294b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2