Malicious PDF — malware analysis report

Static analysis result for SHA-256 2846d57b639aa927…

MALICIOUS

PDF

75.7 KB Created: 2021-04-27 19:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 055c43e77a8d1d17f68295db1031babc SHA-1: 23c8284ee6fff2590acc9e392b962d6b476b21d0 SHA-256: 2846d57b639aa92784e92c7233dfc0d888f46cfbcdc85eb64c4909fb3f124669
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=what+is+unobtrusive+measures
    • http://setafugeridol.scienceontheweb.net/duwerejarelusowokigo.pdf
    • http://sdek-24.cc/77430187342fu6t9.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://meriline.store/74003083986klzxr.pdf
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/9122b90.pdf
    • https://tebizojejifijof.weebly.com/uploads/1/3/4/5/134589629/vizamadijub.pdf
    • https://cdn-cms.f-static.net/uploads/4477921/normal_60418cb4b1211.pdf
    • https://sorezoxawo.weebly.com/uploads/1/3/2/7/132712551/zomovexilewa_dokeje_muwimokefegetox.pdf
    • http://acupofjacob.com/nuxoridijenawumitugfvibf.pdf
    • https://cdn-cms.f-static.net/uploads/4447646/normal_601dd71940155.pdf
    • http://complect-tech.ru/69109185289s471d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_453c5148f1494d90a63b259512c52998.pdf?index=true
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_3fd9ea58a14949cba586efeeea24e4c6.pdf?index=true
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_434b57dcf7294ff5a469b6a9d8a2bbfd.pdf?index=true
    • http://fidikaxano.myartsonline.com/exogenous_shocks.pdf
    • https://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_3429501a8db041fc9b1b1f9734809fc8.pdf?index=true
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_3ed7a397ce0d41c48ba0e67e3541ca9a.pdf?index=true
    • http://sulenovigadi.myartsonline.com/jomuzosizi.pdf
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_a3f8a9fe5142437794bd1c5be70404ed.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed04.bin
3e0de5ef06734297e2b67441956e6554d16aa0be48e44e6b5ceed896ee7e6c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 5104 bytes
font_01_sfnt_off0000fe46.bin
cb85e070a670a02a891a9ab3891c0983242a4b81198591b003c47e4cfe951132		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 10504 bytes

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