Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b65a751a28687e…

MALICIOUS

PDF

68.5 KB Created: 2020-11-13 16:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31e2b91ceb7e7455dbfbb11d35e3397a SHA-1: bbb085ebdf19bef1ace668883e1790762cf71941 SHA-256: e4b65a751a28687e084ae01dbb79dbca44d7751e426994a55379e2f9e13502d9
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to suspicious domains and one specifically identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=girl+scout+senior+cybersecurity+badge+requirements+pdf
    • https://giximelet.weebly.com/uploads/1/3/4/2/134234701/paribatifunato-mokopawavidil-kovijajexogewuf-fapufom.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7354785.pdf
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5fa18fcdb06f0.pdf
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5f8e78fab2097.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vukumesoj/headway_beginner_download.pdf
    • https://s3.amazonaws.com/xezujuxoz/area_of_composite_figures_guided_notes.pdf
    • https://s3.amazonaws.com/susopuzupure/nigexuvunisel.pdf
    • https://uploads.strikinglycdn.com/files/53940c68-a862-44f3-82df-1ce910132baf/56009829085.pdf
    • https://s3.amazonaws.com/xumakomowi/a_byte_of_python_russian.pdf
    • https://s3.amazonaws.com/gumegulaxi/sad_kawaii_faces_copy_paste.pdf
    • https://uploads.strikinglycdn.com/files/61f7c53e-d9cf-4891-b1ea-d7b8fdb86e62/descargar_musica_gratis_mp3_para_laptop.pdf
    • https://s3.amazonaws.com/varolexexus/31166475308.pdf
    • https://s3.amazonaws.com/kiwopusafize/wills_for_heroes_pa.pdf
    • https://s3.amazonaws.com/lurutopobi/descargar_juegos_apk.pdf
    • 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_off0000cad9.bin
1cbcbd16f0d215655939f129bb23614f0e722db567c34b127c4c5756e08ddc10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD9 5872 bytes
font_01_sfnt_off0000dec6.bin
fd0b71e7d0330e7545107496feb320556d6514e15754dc0dc75c6f237aa3fc1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 10428 bytes

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