Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce2028046f12cff…

MALICIOUS

PDF

77.1 KB Created: 2021-01-13 03:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 715d88d518dcd00110ab8f739790d52b SHA-1: 71803e65b2c5e91963617b745154d6c885f41d96 SHA-256: 3ce2028046f12cff1d4d2652180b5b135d1b9f9a1f52db935a1308a557c27e79
164 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, suggests a lure related to exam answer keys, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffset.ru/123?utm_term=answer+key+of+jee+mains+2019 PDF link annotation
    • https://cdn.sqhk.co/simunenij/czjjFTt/ninja_mini_bike_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f875fc0dd4c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_5fc2997f6ce37.pdfIn PDF document text
    • https://tirotulesi.weebly.com/uploads/1/3/4/8/134849952/95fb8eb5.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/jcljiU4/redbubble_reviews_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/TVcAQkk/tewitamenabokemibud.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/zesojevorijetut.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/gegeBif/fazanan.pdfIn PDF document text
    • https://site-1173522.mozfiles.com/files/1173522/cool_ringtones_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/59474977058.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/nubutatugifisibukarig.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/15495915350.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 6416 bytes
SHA-256: dc7ab62629aba76a2a1ae9c13196ab608952013a673348275611bf62f0f4ec9f
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 5684 bytes
SHA-256: 11aa77a4ceaf35cd69106373d12a148300772d9f3633b8f76544499ff9263f38
font_02_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 10804 bytes
SHA-256: 52a65655b2c6225a557f1df2e5235637d79e4fc4f2ed34a095814ea5c0d93275

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