Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a773dea1e822f02…

MALICIOUS

PDF

74.6 KB Created: 2021-04-29 14:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e73e5abb8a678e97712ab5786028aa5 SHA-1: 72b2485543eb84922e5594f4ff659b5fe664f96b SHA-256: 3a773dea1e822f02304859bffc4b660173814fb8cb091196cf58a3ac8b38b3eb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'stock market futures', which is likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=stock+market+futures+for+tomorrow+chart
    • https://cdn.sqhk.co/fegokirar/eVbhfrq/64394386903.pdf
    • https://cdn.sqhk.co/fepefudasor/hgichai/bbc_dinosaur_world_game_free_download.pdf
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/ee2fc7d2d47ea.pdf
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/8871c045989.pdf
    • https://cdn.sqhk.co/kosibowo/ahiPdhe/album_songs_tamil_isaimini.pdf
    • http://reduslim-europa.site/wizardry_6_bane_of_the_cosmic_forge_download0ievi.pdf
    • http://sibuvre.com/466308969532l9rd.pdf
    • https://cdn.sqhk.co/xinulezebi/ihyAIgi/90849635104.pdf
    • https://cdn-cms.f-static.net/uploads/4405662/normal_6025395feea87.pdf
    • https://cdn-cms.f-static.net/uploads/4475861/normal_60110ad1a949a.pdf
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/dobaxuwalusudura.pdf
    • https://cdn-cms.f-static.net/uploads/4367013/normal_605f8ad34f0d7.pdf
    • https://cdn-cms.f-static.net/uploads/4483104/normal_603a738641da1.pdf
    • https://cdn-cms.f-static.net/uploads/4455884/normal_601537d803563.pdf
    • http://uuuuull.space/bonfiglioli_vectron_act_400_manualyi1g4.pdf
    • https://cdn.sqhk.co/dimosiwela/bKgfXZZ/happy_diwali_3d_animation_video.pdf
    • http://iglivesupportteam.com/rosogiwepanezatehlqgh.pdf
    • https://zejatuno.weebly.com/uploads/1/3/0/7/130776413/5506038.pdf
    • https://cdn.sqhk.co/kipasewimoni/LWav8jh/3770423578.pdf
    • http://getsalle.xyz/matrix_organizational_structure_ppt_templatek4x0g.pdf
    • http://changepass.online/xanefijokufisolafivax98jjz.pdf
    • https://wikojenuvovada.weebly.com/uploads/1/3/4/2/134266286/watumetu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e436.bin
50194926ce9698e3db09d1098bda17c3e2b62272332136bccb6c4b03c19d853d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 5348 bytes
font_01_sfnt_off0000f650.bin
4993d93c7ef0ab817042add2cf7921cae3ecd82452f586c4293810a0cac37cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 11344 bytes

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