Malicious PDF — malware analysis report

Static analysis result for SHA-256 839ea46bfa1e2ff8…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 22:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cf183051e49d4af63e2b3d4d78bb204e SHA-1: 46cb2c35483fda54427c1d6ab07cb51289d39444 SHA-256: 839ea46bfa1e2ff861605b520b9e71aa729407c6a7047974507b16df6f32cb28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs, many pointing to PDF files on various domains, suggest a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating an attempt to distribute malicious content or phish users. No scripts were extracted, but the sheer volume of suspicious links points to a distribution or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://blueview.nl/app/webroot/files/userfiles/files/zadaja.pdf In PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5ff8848e1---20349186488.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/ritakatetuxitizesex.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/jumagamokimugubogo.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/29888372165.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/16021039224.pdfIn PDF document text
    • http://metabolit.ru/files/file/31007309217.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/68210433919.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/96058346690.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/jabupulewetuvi.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/52033259325.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/ganadidewozuwawu.pdfIn PDF document text
    • http://nessium.net/userfiles/file/xozanu.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/89715343504.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/76778412100.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/87059560316.pdfIn PDF document text
    • http://irollee.com/userfiles/file/wodonufevunofo.pdfIn PDF document text
    • http://congress.bpv.su/content/files/files/digaxamebafimenilivik.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161436c8f88685---4472483588.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/gefexuziroje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=strymtv+app+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_off0000a9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CA 16208 bytes
SHA-256: 44e57ef402f57de12886fb76d93bd525c455deff14199b68967463c42e02437c
font_02_sfnt_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 10096 bytes
SHA-256: d60df8e5116addddffcb59233e178256e63a722960931a6f8d5c7b64cd2fc501

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