Malicious PDF — malware analysis report

Static analysis result for SHA-256 2573fe85f03c3f16…

MALICIOUS

PDF

82.1 KB Created: 2021-03-14 18:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5ad3cb241018d481336b2c4fdf1f3bc3 SHA-1: cf374791f7271a42c64b8068bdc0080a43cc9e27 SHA-256: 2573fe85f03c3f16ceeed40ec622a512104192cb61aa04a8f4804a818a337df3
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure related to 'primitive wood crafts to make and sell' and an embedded URI pointing to a redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The primary IOC is the redirector URL, which is designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://kuzutuzo.ru/wix?keyword=primitive+wood+crafts+to+make+and+sell PDF link annotation
    • http://kezinogirojosev.iblogger.org/cuisinart_14_cup_food_processor_assembly_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/1jhn5jj/dawn_of_steel_fo76.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/Ejg4ue6/pet_pals_marble_falls_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/hXQhdHF/bukulidikinusuk.pdfIn PDF document text
    • http://xomaweluk.22web.org/jodupalugu.pdfIn PDF document text
    • http://zixosoliga.iblogger.org/77301941281.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/d9c07b90-da82-4f2a-a1a4-6efbc8674ef8/12410196172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16544de-60cf-4bf3-a5b3-e94c24e03cfd/89752825459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557003ff-eb1f-4d4e-b4cc-d4ab2a8fbeb6/fobezexiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4452c12-5a2e-492e-a297-5826705b9ef1/dewalt_dwe7480_vs_dwe7491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54962f41-d793-40e7-b1f4-0c8b7c2282a4/the_little_prince_full_movie_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8e2b1a-6a6b-4608-bf63-fb2318e859cc/photive_s10_bluetooth_speaker_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7dce955-7183-448f-a352-6c90e2fd587d/42123065122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d9c51d-7a05-4099-be2a-7ec0b2f20897/sadhguru_telugu_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a367c07-d460-49b7-976f-727102b27707/taxivilakulebiximu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e9a926-12c1-48a9-91f3-9183dbca9291/93487965300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b971db0e-1849-4b90-b836-91696d99f290/emotional_intelligence_2.0_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1fd8ca-784f-42df-b20d-7ccf3edb196b/og_mandino_books_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954b736c-b98f-468a-b24f-640e55ea8279/phonetic_alphabet_phonics_flashcards_free_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ee5f40-6c4b-4dc9-892b-6c53b9019d99/how_to_clean_filter_on_lg_top_load_washer.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_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 5384 bytes
SHA-256: 5ba0be744bdbd196534cb28921dc25f745ef52471d82c817c80ee776faf179d5
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 10680 bytes
SHA-256: eb9e9a4bdac04fa3584e179966415f7fb22d9f37334bbb7f253d43fdec3aa1b3

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