Malicious PDF — malware analysis report

Static analysis result for SHA-256 59dee1c1a95d26ab…

MALICIOUS

PDF

73.4 KB Created: 2021-06-09 00:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 72e2526f5f05f1a7ec2140b5ebcbb808 SHA-1: ec8178d18fb748e58cd5212e9dcbd16b14fd0591 SHA-256: 59dee1c1a95d26ab7e94a2f6c22e8160cdda9258a25ac2ae78ba2a6eb30227c8
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'Romeo and Juliet' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of numerous external URLs and the ML classifier's high confidence score strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crysiq.ru/pbw?utm_term=act+two+scene+three+romeo+and+juliet PDF link annotation
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/pumikapelop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5ff96d1be5649.pdfIn PDF document text
    • https://dabawide.weebly.com/uploads/1/3/7/5/137511183/191959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_6028704363427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402956/normal_5fd0937975a72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5fdce2167f0ca.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/9c4adc.pdfIn PDF document text
    • https://pefekebemapufug.weebly.com/uploads/1/3/4/3/134370705/wibosurugivitak.pdfIn PDF document text
    • https://sigudajofabi.weebly.com/uploads/1/3/4/6/134679089/2b81757140af43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_601bfde69a2a0.pdfIn PDF document text
    • https://mexakogu.weebly.com/uploads/1/3/5/9/135981712/cf565a4.pdfIn PDF document text
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/5486761.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaturefegape.pbworks.com/w/file/fetch/144898074/55925962267.pdfIn PDF document text
    • http://rawumadakora.pbworks.com/w/file/fetch/144704091/what_is_espresso_testing.pdfIn PDF document text
    • http://vezawegafu.pbworks.com/f/dinumebikok.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/w/file/fetch/144512967/what_is_the_golden_age_of_english_literature.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_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 5336 bytes
SHA-256: f109e867baaf1844b9a07d738a5c3c6fba4ae8b4a4df58941ebc2f04bcdf0040
font_01_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 10316 bytes
SHA-256: 7ba495316cc62cbe52bbd25fd5001ff137cea6a125fae52e13aff5e60e8217ca

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