Malicious PDF — malware analysis report

Static analysis result for SHA-256 83125e002a3f43ad…

MALICIOUS

PDF

84.0 KB Created: 2021-03-30 00:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d102e248ef7f7a7d9a389b729af78480 SHA-1: 1d66ee73975229edd14749990272715d862e0d0a SHA-256: 83125e002a3f43ad427716effb95964ff99b7b29c7af3cf52b56d60cada352c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9997

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://soxebez.ru/123?utm_term=surviving+sepsis+guidelines+summary+pdf PDF link annotation
    • https://wuxagukokixeg.weebly.com/uploads/1/3/5/3/135398542/wumukojigese.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/iicKxyU/magujunu.pdfIn PDF document text
    • https://cdn.sqhk.co/ziloteduxemo/IghdkgG/wuretolisegab.pdfIn PDF document text
    • https://cdn.sqhk.co/dikabopagesi/ijCieZI/16096514604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5fe8c9d9ed501.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/Yighfjj/sofizujuxizipu.pdfIn PDF document text
    • https://cdn.sqhk.co/xoguvamev/qiggfj2/wogejinil.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/3504693.pdfIn PDF document text
    • http://xuxadozikekop.iblogger.org/zefafenerar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_5fd1293e8979b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/how_to_calculate_earths_density.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/14550805078.pdfIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_047c783c0dd440b2a750902129add288.pdf?index=trueIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_7fc1a9f5fbb848bf86eec8e0cbeaa2ca.pdf?index=trueIn PDF document text
    • http://kuxubofejudotif.rf.gd/biogeochemical_processes.pdfIn PDF document text
    • http://kulotobokibipez.epizy.com/95223663198.pdfIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_e3a1c541350c42b8b989c1b50e73461d.pdf?index=trueIn PDF document text
    • https://db85890e-2170-460b-8606-66f64b7b3c0f.filesusr.com/ugd/1d3654_8a2e081186e14e38b527634e6c583061.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/indila_love_story_lyrics_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/compound_personal_pronouns_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/blunders_crossword_answer.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_f27ccf94bc1747cba7a2dbcaea9d4b0a.pdf?index=trueIn 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_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 5624 bytes
SHA-256: e7335facc3f418de77108a31406fa11861c6403068d86efeec9c56a35dbb1e79
font_01_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 11232 bytes
SHA-256: d26d6f4ab82786d78b396e7901e55a16ce0c2a19337f51d3643210548ebf47a0

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