Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5a913ab17e376e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 00:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 352f3f4c95f8950f1464d6994ca57cbd SHA-1: 08e5ddda7801a060bd8115ad2e34c4561aa19426 SHA-256: 3d5a913ab17e376efc15e023182b05dd802da270c08a8fb3eebdd1e37fcb35b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable domains. The embedded URLs point to numerous unknown-reputation PDF files, suggesting a phishing or scam campaign designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

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 http://bfttacg.marketsearching.com/upload/files/92389374190.pdf In PDF document text
    • https://episcopiaoradiei.ro/files/butafepixurupaxuton.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/88456614522.pdfIn PDF document text
    • https://basisangka.com/contents/files/24595873172.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142c58431bc5---jinukobidopapifawukuganaw.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/86049605654.pdfIn PDF document text
    • https://clubon.top/uploads/files/foxosefosenexabogixitijow.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/87192075378.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/rojuw.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/55186662472.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/28284922408.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/28212934726.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/19784782223.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/5080220581.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/52834260365.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/pivas.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/visemikunegibutabuxos.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/funizomu.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/poratomokomoxe.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/66395393448.pdfIn PDF document text
    • https://italvaping.com/file/zubegiduzububosumebu.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/sefolitunedotaxunivemov.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/54621579777.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/82347889478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=creswell+and+plano+clark+2011PDF 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_off0000bbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC6 10820 bytes
SHA-256: 15851adb689bebe4e27add7e2bf0f1163359353e65d14b13f61820a908352b10
font_01_sfnt_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 17016 bytes
SHA-256: 09bdd60f13383e09d506c295950bcea5220f5130068ca14322d489483feebe4a
font_02_sfnt_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1