Malicious PDF — malware analysis report

Static analysis result for SHA-256 d833e3128663f980…

MALICIOUS

PDF

84.5 KB Created: 2021-03-13 21:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5ae4a224f423fa32fbeaa53443fd80d4 SHA-1: a4ab684a83c2c8fc44fba2bd96765c38ce122eb9 SHA-256: d833e3128663f980cc0999620bf5d154256a0516f4e836109cfed6629b10cd48
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://golowaki.ru/wix?keyword=gopro+hero+3+black+user+manual PDF link annotation
    • https://pofitefe.weebly.com/uploads/1/3/4/6/134617546/rikotud-guziwuxirawi.pdfIn PDF document text
    • https://wopurosifagup.weebly.com/uploads/1/3/5/3/135333772/nanulenedometi_tonavifanetakop.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/Zheghjd/juxopazobete.pdfIn PDF document text
    • https://xidakagufade.weebly.com/uploads/1/3/4/4/134400986/4847576.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/ggcibhe/nasal_polyps_pictures_cancer.pdfIn PDF document text
    • https://zajilonuxiwez.weebly.com/uploads/1/3/4/8/134871265/a44be34.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/kjdUhj9/23465161132.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_3879e801c2164dc9b5dd979f4f695cac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/ardhanarishvara_photos_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/toastmasters_advanced_leader_silver_application.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_035591acf9e74c1f971d14c78345e3d8.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_e76d9888489a48789a39be4f0eb79104.pdf?index=trueIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_fe02553dcf3f478597fd9d0da9f4f6b9.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_2680f25822694f199ade0713c82009ec.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_6d34f3ff300f4c1497e65a875d21ba93.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_74eb75e4d3654d8c85ed0d4bb1d50479.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanalovum/jetugomibijipepiv.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_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 5572 bytes
SHA-256: 1a83baae0c334e97cf0183a9d47bb3bdbe7bdd0e33f75e8f97bdaa0e59b23799
font_01_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 10816 bytes
SHA-256: 8d4d9a23ada7a825bb1918c078cb3ece601d0be7127ca5e70d9f875b3ac85698

Open this report in the interactive analyzer, or submit your own file for analysis.