Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38474016509496a…

MALICIOUS

PDF

78.8 KB Created: 2021-03-27 10:32:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aec3ba0296cf51b8c019b0064a1dffe8 SHA-1: af6dd9d955b6fdbc719378c866aa18b22ca67c45 SHA-256: e38474016509496a084e8f5d3ecc1e8b60ecfe252533dfa38f46c0b349a0dd54
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/award?keyword=biodiversity+and+conservation+ncert+pdf+download
    • http://jaraxusej.iblogger.org/nivowidofurotisone.pdf
    • https://dowogejur.weebly.com/uploads/1/3/5/9/135992185/8a9fb.pdf
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/ruzasi.pdf
    • http://jaxagogilexet.sportsontheweb.net/nagegowavofaduvoxomijafij.pdf
    • http://zonerokemub.getenjoyment.net/38968833195.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f9b8eae-2915-42cc-a1f1-7ba8950ea7e3/ritofokizepifepadepetaj.pdf
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_91bf31b9a2d34b20952bb97abee7ffba.pdf?index=true
    • http://lugivodunoxasi.atwebpages.com/alain_badiou_espaol.pdf
    • http://wutesejib.onlinewebshop.net/nozatadikur.pdf
    • http://wavujajelel.epizy.com/31056631463.pdf
    • https://uploads.strikinglycdn.com/files/2e22201d-9843-4bef-ae72-da72646869cd/xasav.pdf
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_848e8dd7214f467d893e9ddfc93af25d.pdf?index=true
    • http://sajonagot.rf.gd/commercial_manager_job_description_template.pdf
    • https://uploads.strikinglycdn.com/files/20fdaa14-0fd8-4899-8594-ea4021d05e43/falimidogitukozebiv.pdf
    • https://uploads.strikinglycdn.com/files/e67a1b48-4ff8-47d2-ad85-0706f987e994/revolution_advent_calendar_2020_priceline.pdf
    • http://fugovolit.rf.gd/80753548539.pdf
    • https://uploads.strikinglycdn.com/files/6b4c26b8-7599-4c99-acbc-9615aa33d068/citadel_class_cruiser_deck_plan.pdf
    • http://mojozore.myartsonline.com/fixek.pdf
    • https://uploads.strikinglycdn.com/files/174e9897-d07c-4a1b-85e0-1afdfc0feffe/11161347281.pdf
    • http://vanofixib.epizy.com/tifidujizozarabo.pdf
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_c63711be82004152a2444f46052c2e78.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_off0000f569.bin
2504ed165d8294a0fa0fd61d0fa6c92c5f67a55d369253e780060cc76f0efdac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 5452 bytes
font_01_sfnt_off00010823.bin
b021103e7731c0d2e7398171589648562b661c8cfcbe02387856e99a7d00bcbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 11144 bytes

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