Malicious PDF — malware analysis report

Static analysis result for SHA-256 be04b323e08b8206…

MALICIOUS

PDF

75.3 KB Created: 2021-02-24 18:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1c3bd31b67068dfe15de226b0170bbaa SHA-1: e6348b37c6489ead8236aefc6a52fb15f63e2e55 SHA-256: be04b323e08b820638cede1e1f69768134aebb65c3047269aa0cdf2e3f07d88d
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, with the primary purpose of directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by presenting a seemingly innocuous document that leads to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://leonvi.ru/strik?utm_term=what+is+an+example+of+a+narrative+text PDF link annotation
    • http://fishing-rods2.club/chiari_malformation_physiotherapy_treatment4jmev.pdfIn PDF document text
    • http://myirn.icu/how_to_drain_a_cabrio_washerx5pzr.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/12382568766.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/wupunep_pipopekuwuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesafemumibow.myartsonline.com/harry_potter_and_the_philosophers_stone_netflix_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/modelo_disconformidad_alta_mdica_inss.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/kuvul.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/happy_birthday_flute_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/kukitutemuvu.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/79602462541.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_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 5284 bytes
SHA-256: 85c5ffe4306f521ac22a28e1c6ea66a92036b2950768f269abbad7a7fa07c2ce
font_01_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 11092 bytes
SHA-256: f5270b768f84574864d847c239f36e3cb6f42537ce0c718f6d0b878c147514ae

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