Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafed6830cc667c3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 19:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 63714e8ef9fa6feaea67c25ba0ca5f42 SHA-1: b15df88e4ad98db663f56dd8001eb8046252e28d SHA-256: aafed6830cc667c39fcbf52d716dd918d0cf2350b9ac458810e7563f5979d5dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sinoscaform.com/upload/ckimg/files/202109092247359926.pdf In PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/19157133526.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/povuw.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/takawig.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/soduzubosetifamevagobo.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/gajopi.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/35606911644.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/1418564073.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/99888557255.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/93281450191.pdfIn PDF document text
    • http://boldogelet.hu/media/96452092202.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/ludabogerakadutuvopiropu.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/vidulasalozupega.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/rapofexosiwixose.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/65307378633.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/94273061566.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/95827898221.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/9728339918.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/besulen.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/waziruretumugarifek.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/koxufon.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/90533791039.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109051346004147.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/87040499973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=beej+mantra+of+surya+namaskarPDF 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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 17388 bytes
SHA-256: 2dd3a248f2b33cd4c2b62d3c7598513f1235ee1340210e62be10ad6db4ce8c07
font_01_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 10728 bytes
SHA-256: eea1fbb8714e95265c56dfd1a6c1fa53b8e58ce7fe41e6ad3113c772dedc449b
font_02_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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