Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7a411cd4946bac…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 13:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a439b8e5097ff329ebf68334413d819 SHA-1: c5d44b22e1cb76d14ad2f36b71d1eab8fc2d3991 SHA-256: ef7a411cd4946baccebb7a88512382f9715ccaa6e41d29a072c20a45f5582fd0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to distinct hosts, which is characteristic of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://centonze-vini.com/userfiles/files/7586296293.pdf In PDF document text
    • http://hasomedia.com/userfiles/file/50513800055.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/14799489472.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/soxape.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8db90493---renal.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/28603023497.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/supogusonodijovejitupir.pdfIn PDF document text
    • https://www.znackakvality.info/files/lujelekasiwigenunox.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/bavosiv.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/59581068277.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/lelapabotojuxot.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/berajesenurexijizez.pdfIn PDF document text
    • https://moolans.com/uploads/files/luxezuf.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/97623400323.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091614422328948.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/ligamalifumejagogamenej.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/92633564233.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/tukoretinodarefew.pdfIn PDF document text
    • https://ekransamara.ru/files/nikutufokog.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/bajepolikurezaxepoxanim.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/72638117796.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/74008088934.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/93677745108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+find+my+wifi+password+in+androidPDF 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_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 10672 bytes
SHA-256: 92fae05049a9fc626f76c7b9dd456808359f39eadeff4fa1030aa60f60cf5067
font_02_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 17672 bytes
SHA-256: 137f31fb24eaf8459bbbb9a715da4293e77fb21c0b42c3cee489fd7888e09ed0

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