Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b8f1e198399fba…

MALICIOUS

PDF

85.1 KB Created: 2021-03-18 16:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd989f4f6f6f7a250f61bdf5d98d6df0 SHA-1: 7ccd8f53d2dd7119e9ac1bcae78db9251a20d22c SHA-256: e3b8f1e198399fba322e5afb5cca42db59bd8803083c71ead3847430d5c4e456
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=canvas+painting+ideas+easy+step+by+step
    • http://jakesubinosol.scienceontheweb.net/amiga_date_cuenta_libro_capitulo_4.pdf
    • http://tobufupevujuma.mygamesonline.org/vanenuvosaw.pdf
    • http://moradudipomibo.mypressonline.com/kizozam.pdf
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/0336381.pdf
    • https://renugukid.weebly.com/uploads/1/3/0/9/130969315/5741936.pdf
    • http://bexixibeguben.sportsontheweb.net/36041771251.pdf
    • https://bunutawopuzo.weebly.com/uploads/1/3/4/8/134868528/1154518.pdf
    • https://mamapesuwilataj.weebly.com/uploads/1/3/4/8/134857931/xaralugikofa.pdf
    • http://pemotutafid.mywebcommunity.org/what_was_radical_about_congressional_reconstruction.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bebojivim.myartsonline.com/rarosipizogugurum.pdf
    • http://tulajadulixo.myartsonline.com/zotokimibas.pdf
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_37cdb7dcaa894e64981cc1ef9ad97efa.pdf?index=true
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_48754f0335a9456fbf4e33f32f36e14c.pdf?index=true
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_66924b8836724cfd9acc25dabfd36d29.pdf?index=true
    • http://tupesom.atwebpages.com/alternative_investments_wiley.pdf
    • https://s3.amazonaws.com/pulavokaxe/7232785273.pdf
    • https://s3.amazonaws.com/jumedemimo/52004889232.pdf
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_e9bdb2e47b304b5eacdeff4dd4985c8c.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100c7.bin
cb958e39f5a7d860bf809d8f2d0ea90e6f3cafccc0670807ebd3ac15a62ad89b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 5000 bytes
font_01_sfnt_off000111e2.bin
e8fd0abc28bb1e66a86b3461070c423ebb6350597f86feb9fcad65b85166e236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 11672 bytes
font_02_sfnt_off00013927.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13927 4324 bytes

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