Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdadf31e127aba3…

MALICIOUS

PDF

70.7 KB Created: 2021-09-22 22:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 441ac473e819cfd088c784fb9be2c337 SHA-1: 574713b72ddbc74bdc24dc7780ad4047ab318eb2 SHA-256: 9fdadf31e127aba32028e95b3bfde64473cc364aa5a49b9fb2b6b5b1f5daa149
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, including one pointing to a potentially disposable host. Although no scripts were directly extracted, the PDF structure and the nature of the heuristics suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 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 http://podlahyadvere.sk/editor_uploads/system/files/8987536011.pdf In PDF document text
    • https://efnnma.org/files/file/sukoxupamokagawu.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/norigoka.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/67849754040.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/tinuvixusak.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210905113741.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/xowaninenuxojitakalujuve.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/89213783635.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///ribepawovonawaxasuk.pdfIn PDF document text
    • http://risme.vn/files/43578923805.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/negakag.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/rimujesun.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/95005841767.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/68409355746.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/66664226307.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/safumapis.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/501101_93120973725.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/fedolidezegagu.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/virokera.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/buwif.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/rapejuji.pdfIn PDF document text
    • https://geniodelweb.com/file/49972611071.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/xegivixudexuvipidubax.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vuradami.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161461ade1f121---jigaguxitalijeroviwurefa.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/50585304267.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210916_062655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=follower+speed+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A3 10244 bytes
SHA-256: a81f34f604501c7a932975b8175f668cd214141cf56ccd37170c664bcd5f9300
font_01_sfnt_off0000cfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDA 14932 bytes
SHA-256: 19d539bf570f6d87e294430ce5585769ace2d0736baf70e1b2cfde2013f65096
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1