Malicious PDF — malware analysis report

Static analysis result for SHA-256 039f6952e85c0f87…

MALICIOUS

PDF

75.6 KB Created: 2021-04-05 10:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5dbdc92e478b21f204c1f9ab888915e2 SHA-1: c69ff7e197e774609fa7ac562c862bd156f6d3ef SHA-256: 039f6952e85c0f878f558ac3ffd66d31ec0a06dcc72901a55c8c81981e7539f7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://zajinet.ru/award?keyword=nature+s+cancer+fighting+foods+pdf PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://fefefilax.weebly.com/uploads/1/3/2/7/132712664/jidawobinol.pdfIn PDF document text
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/kezezarep.pdfIn PDF document text
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/e6babf9c.pdfIn PDF document text
    • https://zupakikaxabu.weebly.com/uploads/1/3/1/3/131380404/jexuxixataluj_safupudekaba_nosadas.pdfIn PDF document text
    • http://ovca.space/51140693528wnkxm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74272f0-efcf-4046-b2b7-02355e382da2/two_way_radio_headset_for_motorcycles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494ab86c-2511-46b4-af19-ba76f817ecbd/minn_kota_autopilot_compass_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fca1a34-a715-4e41-b521-5611fde3843c/tazixubog.pdfIn PDF document text
    • http://xijisunuma.rf.gd/rewusowum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebeec87d-16ad-4238-96a6-864497302f56/diary_of_a_wimpy_kid_the_meltdown_free_online.pdfIn PDF document text
    • http://vaxufedujij.rf.gd/invicta_watches_for_sale_in_pakistan.pdfIn PDF document text
    • http://jomobagezib.rf.gd/guitar_chords_for_popular_songs.pdfIn PDF document text
    • http://tuwigugu.rf.gd/bare_infinitive_exercises.pdfIn PDF document text
    • http://duvubatas.rf.gd/movimiento_ondulatorio_ejercicios.pdfIn PDF document text
    • http://fasevofal.epizy.com/jacques_bainville_histoire_de_france.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69315df-7d08-47ce-a87f-f3c028b3054c/are_old_nancy_drew_books_worth_any_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39dfd619-9e43-42e4-aba7-c8a2a1031634/82801347965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6412c6-3658-414b-9584-57ebc33c3023/39299213657.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_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 5352 bytes
SHA-256: 86cf0c3472896268a7c22c2796c12db3256e356d6191bace795f67a84a25a276
font_01_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 10448 bytes
SHA-256: 6e228f00329eba7258312fe43e4e92eb0924c2b3bfd8bcf51515a1899727e0ff

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