Malicious PDF — malware analysis report

Static analysis result for SHA-256 28acc5768e8f3568…

MALICIOUS

PDF

76.8 KB Created: 2021-03-14 02:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3070d1c5e54e07905e66f5f772e77e35 SHA-1: f5c5749bea4a43e424fb058d13e46eafe07a2ce8 SHA-256: 28acc5768e8f356829eff12cd41ca8d85241c2275a7da53461755dfc736f1066
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external URLs, with a critical heuristic identifying it as a malicious redirector link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the embedded URLs and the PDF structure suggest an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=contrato+administra%25C3%25A7%25C3%25A3o+de+condominio+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_6027b529c5955.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/4605508.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/i2plnhh/when_will_yellowstone_season_4_release.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445118/normal_602c2976122d1.pdfIn PDF document text
    • https://jugotazotezolut.weebly.com/uploads/1/3/5/9/135973864/nabavekovasanimope.pdfIn PDF document text
    • https://cdn.sqhk.co/xunixenovapi/djchihf/apocalypto_tamil_dubbed_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/ejbiejh/mirrorless_camera_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/Fhbhhhz/1360867791.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/hhlqwBZ/41354237993.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/xapota/73834290423.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/swat_training_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/boxozit.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/ladder_diagram_for_bottle_filling_plant.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/fojedujudowukebojuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/70936682081.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/81104473305.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/budob.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/nas_navigator_2_buffalo_win_10.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 5672 bytes
SHA-256: 5e046a1f185580001866e444d5669425b0a44d7e1c73bfa19683ed4b11a12108
font_01_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 13552 bytes
SHA-256: 693559fffe9f719e680ef7ad4f180061d23ce6e5f8db792eb1ba5eeeaa4c9564

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