Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf55d72ac60ef28f…

MALICIOUS

PDF

74.7 KB Created: 2021-02-26 04:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bda03b965ab2e85f34980f9ee2fde1cc SHA-1: bfcb492f46e65fc903176def000f10cb3d6adfac SHA-256: cf55d72ac60ef28ff8cb7636cf0d828ff9f83ccdc4bdb404d3d90fb36dfb3b38
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit vulnerabilities or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=vanessa+jason+biology+roots+comparing+mitosis+and+meiosis+worksheet+answers PDF link annotation
    • http://kfnwejfnkwheklf.space/najeeb_members_area_loginm4ra8.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/zawexofarukofuwibovewod.pdfIn PDF document text
    • https://wudivaju.weebly.com/uploads/1/3/4/7/134762352/c40d98d.pdfIn PDF document text
    • https://jomibijavajele.weebly.com/uploads/1/3/1/4/131409275/6041941.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/8090909.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/fenapilev.pdfIn PDF document text
    • http://muldwych.com/21894716642u37gy.pdfIn PDF document text
    • http://sale20.site/fegadupunosej5a5iq.pdfIn PDF document text
    • http://amsidisi.xyz/copenhagen_burnout_inventory2d7ry.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toguvaju/tamil_to_english_oxford_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/whatsapp_setup_free_for_windows_10.pdfIn PDF document text
    • http://namutogenasokab.epizy.com/36368284111.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/97719133212.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/how_to_add_fuzzy_lookup_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/77725221409.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_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 5924 bytes
SHA-256: 51d7835fa638057027a735fe16302123633a0880dc38e84c8fd1522949b19ee7
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 9920 bytes
SHA-256: 4a23a85baced34012a9fb18c6c1aac77b4e13ce26d625bd559911c70a20535a9

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