Malicious PDF — malware analysis report

Static analysis result for SHA-256 331a778b280d8109…

MALICIOUS

PDF

78.7 KB Created: 2021-05-14 19:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c6f9dcbd551880aba9f7a099eabf1737 SHA-1: b88dbbe5c30867547dfa58f10c78502446424236 SHA-256: 331a778b280d8109b7a8383f359acf1f3434483028afd86da5a9a2a0bcfb3b1b
64 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 0.9042

Heuristics 3

  • 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
  • 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://pelibifir.ru/strik?utm_term=gmc+ms1015aul+compound+miter+saw+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448337/normal_601b6eef5d1a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_602093a7c4cfc.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/ZYjgCY0/osm_scoutlist_2018_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421767/normal_5fe9011ea26f9.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/jNXyjiy/33353375278.pdfIn PDF document text
    • https://cdn.sqhk.co/sepexapubu/gqghwjd/shoot_bubble_deluxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_604d709a2147d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488130/normal_5ffd046a825ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_58be8ecbc4f946c2a0d7775f92d28746.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af1fe63-f63a-4b9c-9adb-3bbbd915bf6a/83344246686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e79d63e-3956-45a3-8dec-57ea3ddd0605/beginning_arduino_programming_source_code.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/snura_chura_free_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d417484a-cc18-4e6a-8553-6bc95781e353/mil_soles_esplendidos_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/how_much_is_midnight_sun_book.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_00716afbe40547af819debd7863b2281.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fibesezati/cooks_essentials_pressure_cooker_recipes_chicken_and_rice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a2d3cb-a6f3-4101-9531-094b81eff71c/divina_commedia_paradiso_canto_1_benigni.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_f30f00f16d7f4d24b1f2d982297a995e.pdf?index=trueIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 5660 bytes
SHA-256: 2249e48bb4a3eb718a73265d3f5eb024d054b7980601083943270f200f842105

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