Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6bdb06e3c9f68e…

MALICIOUS

PDF

73.6 KB Created: 2021-02-15 10:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0aad2277cb6f5e45e19e0c6b1c96e0b2 SHA-1: 71ec2c0661f14ad0bda5ac281f49c19090406e1f SHA-256: 9d6bdb06e3c9f68ecc5752d14cd617bedf99ff0fb4a1a7b983e6dbe4497e1313
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, many hosted on disposable domains and configured as link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=example+of+critical+appraisal+of+qualitative+research+paper PDF link annotation
    • https://cdn.sqhk.co/zotofoza/5jhgeqI/terenigu.pdfIn PDF document text
    • https://cdn.sqhk.co/jiliroba/f7qghgh/14415847615.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/Bhigegj/wekak.pdfIn PDF document text
    • http://xojuxegalixiluj.66ghz.com/70384589222.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/1upihjh/lynx_spider_poisonous.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389792/normal_5ffda80157694.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/WKijiiw/19125255479.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/oyXSjcA/23397731460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_5fe8ca585f0f6.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/tidigudetefumof/28469527322.pdfIn PDF document text
    • http://tuvojiteziw.epizy.com/atal_bihari_vajpayee_kavita_video.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/fluid_pressure_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/83846731013.pdfIn PDF document text
    • http://fovuxux.rf.gd/25623723366.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/animal_crossing_wild_world_ds_hair_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/cartoon_movie_mp4_3gp.pdfIn PDF document text
    • http://bafilus.epizy.com/76711775422.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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 5468 bytes
SHA-256: a954bdd4436054d8d05b8bc0edae9abbe2f1aaa3b930c9603ea63e6c6af0bdc4
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 10468 bytes
SHA-256: beb7bb12850b6b1ff59975c23873eaed0e35cd1609ccdd88af8ff4ea22784fd8

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