Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68cb0f9c1d78536…

MALICIOUS

PDF

78.4 KB Created: 2021-03-13 19:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c4c2d91fd3c597041a64115994076fee SHA-1: 13b8cd1d49d6ce7e4f9673c51f728e3dfc36a63d SHA-256: b68cb0f9c1d78536f756ab7d0f6e39bff6dbadff8c3439aee8c21ac7a062f8f7
66 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 0.9998

Heuristics 4

  • 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://fokemale.ru/award?keyword=colpitts+oscillator+theory+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413975/normal_5ff05f40ebd75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_603bd5a58535f.pdfIn PDF document text
    • http://kilesetemopibaf.22web.org/sakuvigovoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_5ffc586b89ba9.pdfIn PDF document text
    • http://ruxakemo.22web.org/38910135847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482018/normal_6037380a8aee2.pdfIn PDF document text
    • https://badukixekuxa.weebly.com/uploads/1/3/5/3/135388400/dijojalaruw-pijebixajij.pdfIn PDF document text
    • https://winozijatefazo.weebly.com/uploads/1/3/5/3/135327399/732f5cbece499dc.pdfIn PDF document text
    • https://nogulakotu.weebly.com/uploads/1/3/0/9/130969216/2784790.pdfIn PDF document text
    • https://vidowenabep.weebly.com/uploads/1/3/5/3/135322196/6208503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gesebokumu.epizy.com/49539037584.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_ee4aff6ce2194da6b9a6b530592ac50a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecef86de-d87f-4b68-bfbd-7359a2efa808/xepatu.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_f97ed40253ac4c9089ff2e95c449912f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c887ac72-f7e6-46b5-a5df-729665bcb0b4/94721592439.pdfIn PDF document text
    • http://fusiwati.epizy.com/percy_jackson_the_lightning_thief_movie_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f96425f-58d9-4d97-9ca1-2d5e09d9689e/microsoft_office_practice_exercises_free.pdfIn PDF document text
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_9d604a13ecff469ca6a3ac7816c257a6.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_b4f1abb05e524b4eb049d3351775fc16.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_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 5248 bytes
SHA-256: 4b799d1a41c3bce3e0e94086defc9b0866e7553f659b58e45bfa43f54fefeaac
font_01_sfnt_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 11656 bytes
SHA-256: 10396934a77de04fc5a77a27a6227d1ac226a7112bf71bf88101403802b0032e

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