Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd84e08dba43d9c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-09 11:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8576ff9de802c6db3b1852986d5729f7 SHA-1: 66c12c5fc3da223c8b321eccf317c1ba78b57e06 SHA-256: ffd84e08dba43d9cbef855b62de4cd2e70a0a265f17934b8566117581603f5a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs are embedded, many pointing to other PDF files, suggesting a distribution mechanism for phishing or malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tnslib.tools/userfiles/files/zomijot.pdf In PDF document text
    • http://wib24-admin.de/uploads/file/pikak.pdfIn PDF document text
    • https://tavio.ru/files/file/vojobiledoxefabukuw.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/retuwudajekuvikebux.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/mezepi.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/gojogiwokata.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613827d26fbb3---90314620879.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/midaloxet.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/watubamenopomukafemefewiv.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/fukodegaz.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210908065051.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/dedawen.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/nezalurenekutivazer.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326ec4018b3---46177293275.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/66458944209.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/90021425403.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/57037102392.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/38535583565.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/76305446945.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/xikuzepofudajox.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/32408161355.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/43797894022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=es+file+explorer+apk+download+old+versionPDF 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_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 10724 bytes
SHA-256: 438fb167e9a64e2af752ff47aa2d49d11afc6bbacfa5af379afd3c8b7358f913
font_01_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 19660 bytes
SHA-256: 1033aa476dfdd2f406e70ce25206dbddbd65aca427cf9d4c46b63168cc5af336

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