Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e43edff91f575a9…

MALICIOUS

PDF

70.9 KB Created: 2021-03-18 03:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6bea628048e81af0424dd24ecf7bfbd7 SHA-1: c8b16dce4563300d0ee0173e30fa32c8bf257b9a SHA-256: 1e43edff91f575a9e649c87684a66e571d0b1f68241afb42407169eed9f3a869
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the presence of numerous external URLs points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=almacigo+de+cafe+pdf PDF link annotation
    • http://muzibatixabu.mypressonline.com/english_grammar_book_2020.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/firafefigo.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/defining_functions_in_python.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/3ibBghR/wwe_thunderdome_tickets_price.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/vupanalefokegusotug.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/d4hfjir/1729880258.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/2idhbhh/cars_movie_poster_free_candy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_9ced15e237c9492e95f75da08ecaef4a.pdf?index=trueIn PDF document text
    • http://zesafemumibow.myartsonline.com/78102851032.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/15856441667.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_6af2709a3e224b178ee2835e0b092db3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db22ce1-415c-4bb7-bd4f-6d0100d76d8e/71688637833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8d7f17-ef76-40fe-bb35-4c0ccadd54f7/novation_launchkey_49_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfee6976-4cdd-4bbb-84a8-6fed14c02343/what_are_the_major_principles_of_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34a21af-847d-4e5f-8e37-6cdc6b4816ff/pyramid_principle_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec4bf29-7426-4627-8c1b-daf5dacdbb84/hermosas_criaturas_saga.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_8d3406e56ec44161bad374b31561e2e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3ae5db-eb4b-460d-9e84-8a0310244fe2/99363306038.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_95ad5e2de2c745c496c4d41586c262fa.pdf?index=trueIn 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_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 5192 bytes
SHA-256: b6603dd5e41015c244fcbedcbb0d30598bfb3f829f2c50597e4e3996ba204cf8
font_01_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 11724 bytes
SHA-256: 8a7c7294b2284c6442d88d344d3cbdb291fa4e6ce6f0017492a637228156c3d2