Malicious PDF — malware analysis report

Static analysis result for SHA-256 895e6ff0cdff718f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 14:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c90320fcb6806bafb0455f62df5e186c SHA-1: 1d86dfe58cec0e6572fe533e18779b0ccf315ec6 SHA-256: 895e6ff0cdff718fb40bb7d8a26fc8aab9f78db3da748d48736541bc3f6857f0
146 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. Heuristics identified it as a link farm and a potential QR code lure, suggesting the document directs users to external, potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/84067169751.pdf In PDF document text
    • https://rhuyscampingcar.fr/images/files/23451555608.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pegitodonepaperenevetes.pdfIn PDF document text
    • https://rippa.pt/files/file/foxejowirenawuxowepu.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/tosepemojiv.pdfIn PDF document text
    • http://obrazyramix.pl/userfiles/file/56740223270.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/26349814109.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/85552262534.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/gefomav.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/85878916249.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/24036859484.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/pawivugisebuwudavuwonix.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161470d9fca82d---92549951780.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/60436346129.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/wametelajek.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/35377085876.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/lafomapuresafefipawexezet.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/53918992216.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/vekiwimubenemazizadiz.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/8508993697.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/63323500407.pdfIn PDF document text
    • http://dentistturkey.com/image/files/jifukawejo.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219221456236971.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/tizefunulagim.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/rajerofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+qr+scanner+no+adsPDF 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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 10252 bytes
SHA-256: 5173554cade6fc526b857f1c1dfe603ca03f7a51b8bc5685037d1e44b961ee33
font_01_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 17648 bytes
SHA-256: 82b92c93b02b0b697fb8cd1d8b5fd6cf50f10f7aaee24b04272079057ba5cb89
font_02_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1