Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7673a2c727502e3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 20:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec602a9cbc5c2795308664858eed4213 SHA-1: 25c67fea5009261dd1bc46796b33eaaa346a3b63 SHA-256: c7673a2c727502e3ca0dcd967e4b244c900ca5c445df21dad68302b15f755400
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=change+bandwidth+android PDF link annotation
    • http://88cpap.com/userfiles/files/8679407133.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/15995450327.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xanewasefejurojej.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/52728829826.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/52222694251.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/22451036190.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/wozawinetikis.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/10141605887.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/punupabagaledoxedoweduped.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c3b44bf65---94687861410.pdfIn PDF document text
    • http://machulski.com/public/file/72650899936.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/dojatazerinudanavixoboxa.pdfIn PDF document text
    • https://onlinendttraining.net/files/65820509472.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a492a90ac7---94907517796.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/7759594757.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/gasabesevogom.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/sobabewigenuvakes.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/45062571481.pdfIn PDF document text
    • https://atiksigorta.com/files/28408753172.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/kagilexixanuwozoko.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/mawinexumaga.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/rosotugumej.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/57674900520.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/68587248486.pdfIn PDF document text
    • 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_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 17132 bytes
SHA-256: a45b7bde58f5c0438d4a42cf4e3dbfdf39289d3e841f9d370565e3988ff0c1f2
font_01_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 10568 bytes
SHA-256: b162825b8d5d6c9e68d9cb26378945de517e26488dbf41190083201f2653ff2b
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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