Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a46e71f55cead7d…

MALICIOUS

PDF

75.0 KB Created: 2021-05-15 12:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 09b752742c6d952e6b216c7c64ae30c4 SHA-1: 285002fe59ee3636ea7f21c36130cc62e0c69590 SHA-256: 1a46e71f55cead7d9692d3c19b92a14bdcfeb82b3a15e59610c9a7a6adcd0bff
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The primary malicious URL identified is https://bologen.ru/strik?utm_term=what+is+an+heir+of+fire+ds3, which is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/strik?utm_term=what+is+an+heir+of+fire+ds3 PDF link annotation
    • https://wijideziwu.weebly.com/uploads/1/3/2/3/132303229/kuximesil-denud-jevazelunogak.pdfIn PDF document text
    • https://rujurujubawupof.weebly.com/uploads/1/3/0/9/130969172/01fbd3b.pdfIn PDF document text
    • https://mubuvume.weebly.com/uploads/1/3/4/8/134885019/pujusak.pdfIn PDF document text
    • https://jafazoragi.weebly.com/uploads/1/3/4/7/134769717/644795.pdfIn PDF document text
    • https://foretenam.weebly.com/uploads/1/3/4/7/134700633/8925808.pdfIn PDF document text
    • https://wenuzivubog.weebly.com/uploads/1/3/5/3/135392435/nazababezaxezoj.pdfIn PDF document text
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/4331225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_b8c3fe9fd2b44ce2bd4d758214f3c34e.pdf?index=trueIn PDF document text
    • http://nidexivoji.epizy.com/introduction_to_environmental_engineering_5th_edition_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9630e584-6bf0-4305-a620-1d2060fb74be/whats_the_definition_of_lateral_thinking.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_09be4c10545f457c9c042622d6d26d23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd3d73f-409c-408f-b89d-46bd44f5c79f/probabilidades_y_estadstica_descriptiva_e_inferencial_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/topafunufoduloxekeriwiwan.pdfIn PDF document text
    • https://fdf0fb27-5181-4190-8e1a-80fb86d87eb1.filesusr.com/ugd/2410c9_19d4729d0d754aadb101f1b9f28f5b84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef3342c-143f-413d-a578-f889a444f4f3/dream_dictionary_bookstore.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/ariens_21_self_propelled_mower_manual.pdfIn PDF document text
    • http://kobaxibijusufe.epizy.com/35508521957.pdfIn PDF document text
    • http://napalujimawoz.rf.gd/45638384266.pdfIn PDF document text
    • http://jawikaginixuxuz.rf.gd/50288102323.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/nobanudojeziwakisiraxat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24048963-18e0-4d84-993b-ed92c022216b/how_to_turn_off_schwinn_270_recumbent_bike.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/refugee_council_of_australia_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a40f07-5872-49cb-86f4-901ada9da085/98368148295.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_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 5140 bytes
SHA-256: db8968fbd4d23be4751118f8a1604458f1a9d99cefbe9134bf12a0f5fdbb31a7
font_01_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 11024 bytes
SHA-256: f3ef9e4e1e60b492ea3bfc27ba53de938d76a3f103439d88f5289a7ae6885824

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