Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48f155a24f89caa…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 08:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cca416fb5b923cd658e94853e20c658d SHA-1: 3c3474eb5370eb9b1815b0de9102a0e93f625e53 SHA-256: f48f155a24f89caaabc5b1a20b9a37fa3be616fe613bf0db670624080faff81c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous embedded URLs pointing to PDF files suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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 http://orsini-blasioli.it/userfiles/files/gezikelexesose.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614287c49314f---betalutujuzolatezuxijef.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/tolifimu.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/dirofiregevilo.pdfIn PDF document text
    • https://manenshop.com/upload/files/84323381438.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/59424914268.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210904_2d84f.pdfIn PDF document text
    • http://datcat.vn/2018/file/43401230306.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/12823025635.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/88521449410.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/95987799257.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/kojipomijetoferuxu.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/lisobunalosizidapuzoxu.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/54723441208.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/mojoguju.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/33637796079.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/bekuzitesiletepa.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/78972676421.pdfIn PDF document text
    • https://ms02bet.com/contents/files/sarigetafi.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zugefusetar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hisuite+latest+version+download+for+pcPDF 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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 16996 bytes
SHA-256: 011667ddf727dbfc0843e2c185a6a864558a8a4e26fc9b2474186afbb0c1fd47
font_02_sfnt_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 10856 bytes
SHA-256: 33aec491347a5a96a8cb3ecb05e5689a1fb9a4f54b017362ca91779d54ba44ad

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