Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08642695d0f6961…

MALICIOUS

PDF

74.3 KB Created: 2021-03-23 21:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ba766dcc34ba754433a116276fe4dcd2 SHA-1: dd2fd9ecc0c1229a285ab4d22efaf89fc95d3550 SHA-256: b08642695d0f6961777091a513cab564e6df58a6697d2dfb6819c032c9164215
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to attract traffic. The primary URL, 'https://mezovuduw.ru/award?keyword=pdf+to+word+converter+download+free+full+version+windows+7', indicates a lure related to software downloads. While no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, and the overall structure points towards a phishing or malware distribution attempt.

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://mezovuduw.ru/award?keyword=pdf+to+word+converter+download+free+full+version+windows+7 PDF link annotation
    • https://xuviwutub.weebly.com/uploads/1/3/4/6/134697068/381ed.pdfIn PDF document text
    • http://rcasino.info/2207923673q3ktc.pdfIn PDF document text
    • https://vuwezamubom.weebly.com/uploads/1/3/0/8/130814902/411e8c2c091c.pdfIn PDF document text
    • http://edapog.online/adobe_reader_for_apple_ipadyuxhz.pdfIn PDF document text
    • http://useraisins.pro/is_cfa_marketable_in_kenyacs7np.pdfIn PDF document text
    • http://walletelectrum.buzz/vimabovudejalok7z7it.pdfIn PDF document text
    • http://texno3ua.com/best_new_leadership_books_2020ignoj.pdfIn PDF document text
    • https://wepusetu.weebly.com/uploads/1/3/2/6/132695333/fosiwo.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/21847412629cmmz8.pdfIn PDF document text
    • http://dorightunion.com/70626866642brcvy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_62777101d7864e6fbce276a67ff090f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fapaga/9482496770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51fc0f7-4c74-461f-8605-d91d6d7c11ef/34740561368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c34e439-8ef2-45f7-8964-1fdbd1d892ac/98395440653.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/ditoxidinimemu.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_dc60018b26c046608b9453b5e037b060.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae1a09f-fa97-4e50-897a-8a03e3712d32/what_is_a_red_tag_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4209677f-41db-426c-b67e-5854391f97ed/how_many_calories_in_a_subway_black_forest_ham_sandwich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0e340a-efda-430c-b455-7a1e9da2a48c/pinebajudi.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/12634624096.pdfIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_79273d54acfc46559e301e7cc123bb7f.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_68b0377d520b486284f72644f27452db.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_d8f92140d9274bd7a0fa4c6d25e3b086.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/getizar/85183065361.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/37715144667.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_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 5248 bytes
SHA-256: fc817baaa48b32d5024c49e2a7d5483fcc015937b668c00247a9bd1d1611bedf
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 10676 bytes
SHA-256: 70616b6224703eae862227539f5bd24aa7517efd5b73ab286f67196378a5f7fa