Malicious PDF — malware analysis report

Static analysis result for SHA-256 550d7c42a6e3f4d6…

MALICIOUS

PDF

118.9 KB Created: 2021-04-01 21:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 191b949993284083309cfe74e29b6941 SHA-1: 93b4a8101d5982f3e8d5ac0356a7c4f0e1879513 SHA-256: 550d7c42a6e3f4d6c91cebdc5f2323f9e64074717729274c8832d72b8d026782
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files on various hosting services, indicating a link farm. One of the primary external URIs is https://seumenha.ru/123?utm_term=boogie+nights+script. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://seumenha.ru/123?utm_term=boogie+nights+script PDF link annotation
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/783110.pdfIn PDF document text
    • https://numesenara.weebly.com/uploads/1/3/1/0/131069843/relisezi.pdfIn PDF document text
    • http://mysteps.online/what_is_the_aim_of_retributionl2niw.pdfIn PDF document text
    • https://ruwitopiramowu.weebly.com/uploads/1/3/4/3/134364975/236b033f2972085.pdfIn PDF document text
    • https://rodagekutav.weebly.com/uploads/1/3/5/3/135313742/9937559.pdfIn PDF document text
    • http://lofitner.buzz/how_to_charge_i11_tws_earbudstmzhz.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/db8b79940c5.pdfIn PDF document text
    • http://lnstagramverifycentre.com/pibirewasulalgfb51.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/fogawutaxibu-tetoturewe-karezewikifo.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/46066679126.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijiwaras.onlinewebshop.net/how_many_calories_in_a_fried_tortilla_shell.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/46229754900.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/kerala_backwaters_travel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/zuwakesureparagetos.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/zurich_life_insurance_underwriting_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/is_it_worth_hiring_a_resume_writer.pdfIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_91a1243d3a8d4d2595969d307f5a697b.pdf?index=trueIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_2e16b89d6eb64027a0e79ef2e76d43b1.pdf?index=trueIn PDF document text
    • http://gavofime.atwebpages.com/mejexemolemefuvebibima.pdfIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_21bc0653c8fe4759aec94b536cb12d9d.pdf?index=trueIn 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_off00019496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19496 5004 bytes
SHA-256: cea26725808dbc43ee965514333546854dd7e1655a9ac04cb2a7965ad1e59449
font_01_sfnt_off0001a5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5A4 12112 bytes
SHA-256: 9c679de3d13347f458b9b409422aedc9ae46d5a331b171e4164c3616e86b8d1a

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