Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb348c7eba5b79d8…

MALICIOUS

PDF

79.8 KB Created: 2021-03-30 04:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 95f824d3a6fd09482bea9d0fff8b8c54 SHA-1: bd63c5be631266a558df61daabed73ec4c9572bd SHA-256: bb348c7eba5b79d8b132bb5db71063613e3c1926a91c65692d2d3512e919b845
126 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is 'https://midufefew.ru/award?keyword=cataract+aao+pdf', which is likely used to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent related to external resource redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://midufefew.ru/award?keyword=cataract+aao+pdf PDF link annotation
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/b0803500d86f.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/how_to_get_certified_insurance_agent.pdfIn PDF document text
    • https://dudefusuze.weebly.com/uploads/1/3/4/6/134628774/61fbb64a888ba.pdfIn PDF document text
    • https://romidemifavev.weebly.com/uploads/1/3/1/8/131857114/rutolepu.pdfIn PDF document text
    • http://tadidavazutopa.sportsontheweb.net/35501179132.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/panchatantra_short_stories_in_kannada.pdfIn PDF document text
    • https://jezulusawuse.weebly.com/uploads/1/3/4/0/134000263/leginenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/74e72d43-d3b5-4820-9b9b-dca275ec688c/sea_ray_owners_club_apparel.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_d5831032532444e7beef6b6f3660154e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ddddb98-2024-442e-bb78-e821874e01ee/graco_snugride_30_vs_35_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/amcat_syllabus_for_ece_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d7e121-3ee5-48aa-99f3-7a9b523f163d/506708195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772e826c-b908-4999-b0ea-2efcbf991cfc/was_tesla_the_first_all_electric_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3bf91a-8a0e-494d-91e0-9f0858e5e1d1/midititixepenug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286391a4-1686-41d3-81b3-18c22780ea7b/11840479465.pdfIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_f3c0e9062df340b98c13269fd44e365f.pdf?index=trueIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_f5f9231ad2364398afdce996e7ab8002.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b2482b-3a8b-42fc-9437-b262db47cf41/end_the_fed_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/49698407872.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_2abc249699084c0e8695d7c373704f39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/negonanopix/84476859905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/641e4fea-1356-4c9e-b71a-c92cd4449eb9/gusisikimanaxiduwukanegir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49d573b-1f16-4946-851b-1b623bcb540a/892765807.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 4476 bytes
SHA-256: 19c85f5d2437649d42263d1862e3fcbdd937a80f88bc8167203269f52640a5ea
font_01_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 10664 bytes
SHA-256: 4319be1c5078253a6e448eb66be19306c0b986cf9bd935cc2ba2e90b239cc563
font_02_sfnt_off00012421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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