Malicious PDF — malware analysis report

Static analysis result for SHA-256 579ab0bca5bea28a…

MALICIOUS

PDF

87.0 KB Created: 2021-04-06 09:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d4be37c3d2da98857db40632b766777 SHA-1: 9f69b9717ae6b8f55250b674d4f1815536027c98 SHA-256: 579ab0bca5bea28aa49cec2e76b83c347ad2e52d2a3f4f4089cb06330c6f5be6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO scam. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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/aws?utm_term=owen+meany+chapter+2+summary
    • http://favunewesazut.sportsontheweb.net/11734677978.pdf
    • http://rotiwopofeze.mywebcommunity.org/budgeting_101_michele_cagan.pdf
    • http://easy-money-cash.space/complex_sentences_worksheet_grade_406z8q.pdf
    • http://top-salez.site/business_website_templates_bootstrap_freexb1k6.pdf
    • http://fastpysystem.online/singer_201-2_bobbin28hgv.pdf
    • http://sogixusi.medianewsonline.com/upsc_zoology_toppers_notes.pdf
    • http://pornbustyvids.com/algebraic_fractions_worksheet_gcse4ga04.pdf
    • http://mantenancie.com/56777373889gu352.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_5e3a61b8a2c74fb78f4ec4dcc2061acc.pdf?index=true
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_4ea6b3ad7e5f447eb17372c2d97f575e.pdf?index=true
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_4669a2aef1ca4343908fd3f3b4fd502e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9c0140b5-f3bb-4e6f-9b67-4316b27f1375/inheritance_cycle_book_5_reddit.pdf
    • https://uploads.strikinglycdn.com/files/b53fb079-b5ed-44a5-9c98-e0b197a24b22/75473235127.pdf
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_816dd8a758964b0fa3eebff0217ade2d.pdf?index=true
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_d275c5e0f6224480a50c4d428d23f2de.pdf?index=true
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_c4ce3a7b84e640749a3dfd092ac3d49b.pdf?index=true
    • http://tuzuxutetug.atwebpages.com/ukulele_chord_free.pdf
    • https://uploads.strikinglycdn.com/files/7cc3c242-d205-4486-bf41-0f1019c5c6a8/sevilugokit.pdf
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_700e5487cfb3434b87facd9cc07b7038.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c74677cd-c91a-41dc-ad81-455fe6ddb402/what_should_a_7_month_old_be_doing.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_1a8a1dc4641d45d2a80e6bcdacf4ee39.pdf?index=true
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_5837b9a501194f268db53bc95559593e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011447.bin
2bc2ebbf963b74cd9fc34857931229206aa1a744caa609c733c0df04b7346f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11447 5496 bytes
font_01_sfnt_off000126dc.bin
f7fcc5c13b9fdf554495b8b1a17c9f119690a0a1f29c52add2df4c447cda3e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 11380 bytes

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