Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04521d6089d743e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 09:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c92258cb56f24be39a80fc80d4965597 SHA-1: 3aaaa253b327e1885f23c24a8dce6a738ac95649 SHA-256: f04521d6089d743e30ef7c17caf2d95501c3ae15b248c78346b8d38c2581786b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The presence of these links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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 https://kaptenhoki.net/contents/files/kolusaxi.pdf In PDF document text
    • http://woodlander.sk/grafika/file/komegitimifuk.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210918_062755.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/89961124179.pdfIn PDF document text
    • http://videlec.be/ressource/file/gutijonofomitipukobiduw.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/82067637141.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ab5500557---86055994771.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fakepasufulo.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/zalal.pdfIn PDF document text
    • https://redac.ch/upload/nuwixojewovum.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210903070036575.pdfIn PDF document text
    • https://verner.lt/images/files/96972670786.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/54921603939.pdfIn PDF document text
    • https://ebooksweb.net/files/file/rigitugewosuvo.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/41259255135.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/64755445267.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/25919314486.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/mululinazex.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61350791c5317.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/jimiguwerejojanemi.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/fiwerimovu.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58430573447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+expansion+symbolsPDF 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_off0000d3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D3 10664 bytes
SHA-256: ce0ba802cbeb7bb12b70e5b4ae7b20790ffb542370dc7269ca98670cfd26e702
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 19852 bytes
SHA-256: 9198f35b57c15217170275017ec91caf2b28e210821bf87ae5049aa17560edd1
font_02_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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