Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef216d6b24f553d…

MALICIOUS

PDF

97.3 KB Created: 2021-02-25 17:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2c680d7032b90b0e0ecaab5ea9330a2 SHA-1: 6e53e1a5bd91e3feeeb64f29b3ce9b409e9abe50 SHA-256: 3ef216d6b24f553d482bdacb181174330b0e4bf6246eb75a7ba4d317192b6085
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing attempt. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the links. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious websites.

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://leonvi.ru/wb?keyword=smart%20drive%20camera%20lights%20meaning PDF link annotation
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/67281dcfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421940/normal_6001d4d1dcaf1.pdfIn PDF document text
    • http://rawoferifexa.22web.org/pufumiwusukirubo.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/1817661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_600fd857907a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5fcb2dd47ef3f.pdfIn PDF document text
    • https://wopebodolafov.weebly.com/uploads/1/3/2/7/132741389/tekexefazatafunamaxi.pdfIn PDF document text
    • https://fuliwerupemivu.weebly.com/uploads/1/3/5/9/135983247/jolat_dixaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476418/normal_5feaed890b99f.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/does_the_lexus_hybrid_require_premium_gas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_5fdb2b6fb04c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5fe3d81ca7721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fce8f6be04a5.pdfIn PDF document text
    • https://cdn.sqhk.co/darekomeguv/akjehf4/giant_gunnera_manicata_seeds.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/58199649143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedisijusa.onlinewebshop.net/jukoxawimoze.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/isilon_x400_spec_sheet.pdfIn PDF document text
    • http://pofabavulaxeli.rf.gd/short_biography_sample.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A82 5516 bytes
SHA-256: f2f9284594b8bec2614e20d1fcc8c44889309ae1285692e94935ec01609da928
font_01_sfnt_off00013d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D13 10588 bytes
SHA-256: b1e8e1fd4ed2bdd02b4d10a52d695b30458b090069b25391519ae35d225c97ac
font_02_sfnt_off00016194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16194 16296 bytes
SHA-256: 64b05d175f35acc041037e39514b5bac30eb1d9d41c226231c7c0085634ab807

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