Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddc6a6f5b7a35de…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 17:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d5890f9cd99498e935e64d3c538e866 SHA-1: a5c2e1e3599068f52f58489b236488e9f8947a21 SHA-256: fddc6a6f5b7a35de1dc3dd96e3595d235218ed51614ad2922683750fc51055b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=the+elder+scrolls+blades+hack+apk PDF link annotation
    • https://kisikana.hr/userfiles/file/61824615095.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/99671524781.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/jekukokibokazerinil.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/xalesezefunobenekifazatof.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/94106176825.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8312cefb094411d21dc592a024c4e462/sexufekojipi.pdfIn PDF document text
    • https://datajournonepal.org/files/suvisezuvev.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/pidamosaro.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/86864724160.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/zudebunigedawidoluneride.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/puvinelufevilojekojoriga.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/1159542733.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/finatesogadogakezamekek.pdfIn PDF document text
    • https://gilbertems.com/videos/file/14073639293.pdfIn PDF document text
    • http://babamoleskine.com/files/file/wigakerotiputekamilamini.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/joxubiladogimaba.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/vijafaseduzu.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/27661738683.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/67622674070.pdfIn PDF document text
    • http://metall-press.ru/files/gudefovomulefadurura.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/nidulova.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://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_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 17840 bytes
SHA-256: c5e5f3725d23b031ef500dc5123de59ba18675c97899b8d2db36d097c0db4481
font_02_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 10512 bytes
SHA-256: 79686afbab85efcf132763606139d2a6bae386ba8c5478ea0db818225666ecd0

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