Malicious PDF — malware analysis report

Static analysis result for SHA-256 a509e53554ab46af…

MALICIOUS

PDF

88.3 KB Created: 2021-03-27 14:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d9acc14ddaf80182fb4289b64c9e859 SHA-1: 5d52ca1f49fcce1c4286181f85a1f0befa4a0495 SHA-256: a509e53554ab46af8c4719f063c2c58259905c6302a59236ba747343b5e1aa94
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, with one notable link to 'https://zajinet.ru/strik?utm_term=author%2527s+tone+in+the+secret+life+of+bees', suggesting a phishing or link-farming scheme. No scripts were extracted, but the presence of numerous external URIs points towards an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=author%2527s+tone+in+the+secret+life+of+bees
    • https://cdn.sqhk.co/napefabet/9gdMFbn/marsha_blackburn_younger_years.pdf
    • http://mutinujevax.22web.org/vejiwatigopado.pdf
    • http://rebomiken.iblogger.org/24337448831.pdf
    • https://cdn.sqhk.co/mewuxedodi/ficEjip/jipaper.pdf
    • https://cdn.sqhk.co/lojibuwe/FDgfshi/dinopizezapu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_78f00310dddc4517971cf3f7063fdc2c.pdf?index=true
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_191638ea66f542f0a04ebd58a63eb2a4.pdf?index=true
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_8a0788d5601f4b3d905697992e4c2dc5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/385beba0-524f-4bf3-8915-f89cb3d3540c/how_to_read_music_notes_trumpet.pdf
    • http://jefitotirezakif.epizy.com/vozilisokunanatilexuposuw.pdf
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_8832fc1239134cd68551b29651b437f1.pdf?index=true
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_f1f46d8da94d425b91ec9b589a235b73.pdf?index=true
    • http://mujasanowagug.epizy.com/batekotarila.pdf
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_8a735dea342447aabd7a98cbf9ca0b3d.pdf?index=true
    • http://dulubuli.rf.gd/how_can_you_read_peoples_emotions.pdf
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_dd0bf512574245038dd9edfe00075323.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a6f27376-9572-4764-97ce-fd4eea1f1054/zarenizifuvukikemipazume.pdf
    • https://uploads.strikinglycdn.com/files/6477028e-08d8-4a4b-8712-208a52510f6c/belkin_n150_login_ip.pdf
    • https://d572dbd6-ec42-402e-884a-3db6daac2318.filesusr.com/ugd/6a558d_f47b7ba0f6894db7ab663c0bed216167.pdf?index=true
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_e4a5c356f24c4002b1277914877272c4.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106a6.bin
8e20c75f0700cedfff161526e5092948a1da0e6ab3f249a3ef6783ebf40e8e90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 4924 bytes
font_01_sfnt_off0001176f.bin
1d24c8288c7d622a6ada5bbcf64452f44eb803f8f3e842157bfa48bece28539b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 10804 bytes
font_02_sfnt_off00013c72.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C72 16204 bytes

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