Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff84631c41dd503…

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 10:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4ca86e9414701e2e8209ee4e21cff71 SHA-1: 7432af0116cc811160decb87991cdd74e29046fd SHA-256: 3ff84631c41dd50319f82c27e08221de83971e71dabd28ad06b5475c64b97421
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The embedded URLs and the reference to 'minecraft java edition download apk pc free' suggest a lure to trick users into downloading malware. No scripts were extracted, but the numerous external links point to a link farm designed to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://jocafoto.com/fotos/file/5613945330.pdf In PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/34358328815.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/69584791289.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161394bf31dab8---64921447622.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/79842577453.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/xujesimarada.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/95635044848.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/81376726656.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/linugizez.pdfIn PDF document text
    • https://digireg.es/upload/11680692290.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/77548968779.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/boxekunagorabe.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/69260239234.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210906170128.pdfIn PDF document text
    • http://benrassam.com/uploads/files/9001422483.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/18990530790.pdfIn PDF document text
    • https://rafautama.com/uploads/file/66837868417.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/38390598391.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/gozidejujedulorekerojij.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/pupuk.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/55712523795.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/difiwikejopodivuvivuk.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/75706134730.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/17573567380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+java+edition+download+apk+pc+freePDF 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_off0000c9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C9 10812 bytes
SHA-256: fb7d50b5e433ebcc337163399bd0e81a07cd15eef40f395de740949b7f464762
font_01_sfnt_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 17100 bytes
SHA-256: 79166e1da4b12a75c57404e862d46aabc9abead876f3351570c623afee48a238

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