Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb978d197c61536…

MALICIOUS

PDF

72.0 KB Created: 2021-09-14 09:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91661f223c73cfcae14194de6fbc4677 SHA-1: 304ffba70547e9275d5f683087d42e0e6358bb49 SHA-256: 1cb978d197c61536892a07af054e5d27b96c6bd36e3cef0c0d54e7166ab09678
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of multiple external URIs suggests an attempt to redirect the user to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://studioprogettoarchitettura.eu/userfiles/files/dotiroxalurizoxa.pdf In PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/87090651670.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/596085e6ee59f601458d4b38889eb3a1/15236498159.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/vukilinanafota.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/sukisumagunesirelime.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/24836329037.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/89254181997.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/22775076616.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9c92af24---pogizozifek.pdfIn PDF document text
    • http://apex-architect.ru/images/file/98939401942.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/3554755556.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/30890066619.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/xapupusaxakaxowi.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/77625943577.pdfIn PDF document text
    • https://fishuntpesca.it/file/1963726691.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/8594449452.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/69262294071.pdfIn PDF document text
    • http://blueyee.com/upload/file/141205146376.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/pofivanixarakatedafiw.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/23895303708.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/99699873729.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/74935417974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dizziness+in+early+pregnancy+7+weeksPDF link annotation
    • 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_off0000bdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 16696 bytes
SHA-256: 8e9823def0fa4347436b0522e219d9b88b85021c59fcce576b9fceccb8898807
font_02_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 10736 bytes
SHA-256: bd318342ebd34c64668c9d3c1611b2959f4fa19c6eba81ccd71e3e2d72157271

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