Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7a052a772c74f9…

MALICIOUS

PDF

85.5 KB Created: 2020-11-07 19:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2aeff017b67a5868dd61815b7f6fc583 SHA-1: 2850ca932b2ad776f023801b6e87d4d79450722d SHA-256: 9e7a052a772c74f98ec88da1caa6602cfad854ab34d384e8ac9609462f80f1fe
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9999

Heuristics 4

  • 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.
  • 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://trafffe.ru/123?keyword=inazuma+11+56 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5f9d6d671336a.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://jamokexos.files.wordpress.com/2020/11/boolean_operation_catia_v5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a75f8b4-a6ab-4b5c-87a7-fcee1fa6c37c/45568762414.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/clinical_research_associate_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2258e540-1cac-423c-9c01-edfe9a1e9c23/97943623695.pdfIn PDF document text
    • https://lalesadu.files.wordpress.com/2020/11/56917198005.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/guided_meditation_for_hearing_spirit_guides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf76652-6c96-4245-9857-11faca6fc499/48596034073.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/pampered_chef_measuring_cups_microwave_safe.pdfIn PDF document text
    • https://sapifotad.files.wordpress.com/2020/11/luwapekixajitesenimedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a306d0ed-2ae6-44e2-9805-69542493f309/scrub_a_dub_dub_rhyme.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/check_if_input_is_integer_in_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd99c3c-4bfa-44ec-a0c4-6f8f48f014c0/73681460594.pdfIn PDF document text
    • https://mikosefuz492460143.files.wordpress.com/2020/11/70777988362.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 10780 bytes
SHA-256: 51b5507d3be64246c3ba14f798cfbc33c8051b311f0056f736c5b5715feeb458
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 4368 bytes
SHA-256: 0432a846e00d241dcf5d3abe89861aab84ca180a116f3d2bcfc40b261f4a10be
font_02_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 12680 bytes
SHA-256: 66fa8eeb8338ef9264abb03d004c673af33d5813e289ca2ca08f2ab88ec805a5
font_03_sfnt_off00012b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_04_sfnt_off000138ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EE 6100 bytes
SHA-256: f94c8c6a1499c2cda48c1e8a2dcd2f02d604aebb99a9803124b5a9f94f801536

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