Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3326264210ee088…

MALICIOUS

PDF

74.1 KB Created: 2021-02-15 22:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d82ee7f270c7ee5197b05013e8e5b29f SHA-1: da690b3da82edd4543500f03ccdaed0b2a969ef9 SHA-256: d3326264210ee088706492e97e6116adcc12ef52dc77e9e58dd60c77669ef667
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a browser installation lure. The document body, though heavily obfuscated, contains metadata suggesting it's a PDF generated by wkhtmltopdf. The presence of numerous external URIs, many pointing to disposable hosting, suggests a phishing or malware distribution attempt. The primary attack pattern involves social engineering to trick users into installing malicious software or revealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/wix?keyword=dental+floss+holder+walmart PDF link annotation
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/8819148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_6016ffdd12738.pdfIn PDF document text
    • http://trixy-matrix.space/14632517114izwft.pdfIn PDF document text
    • http://ndfnasg.xyz/invites_templates_for_wordfyaw1.pdfIn PDF document text
    • http://fullstacket.online/competency_evaluation_reporttzpqe.pdfIn PDF document text
    • http://itchia.space/venokelagutobogol9g0z.pdfIn PDF document text
    • http://dreamingdeveloper.com/critical_thinking_analogies_answer_k22re4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_5fe8abdcb7633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_60180e8eb35ef.pdfIn PDF document text
    • http://pasendapp.online/gidukelifebuxurikulfq.pdfIn PDF document text
    • https://vafarisitoguv.weebly.com/uploads/1/3/0/8/130874489/xumusalizevi.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/xovekolamoxe/27221935672.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/judarufe.pdfIn PDF document text
    • http://nozanela.epizy.com/fisher_scientific_acetone_safety_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/repofadenu.pdfIn PDF document text
    • http://nazedizabif.rf.gd/adobe_acrobat_reader_dc_gratis_en.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 5236 bytes
SHA-256: 2222f813ffc6841163896f89c48b8b1217c9f5df28a0e00bce52fe71ee247c1b
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 10908 bytes
SHA-256: 749dad0b8dc10c74f235e09414c8be34d724d99294ac7912d7b547619d44509f

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