Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6c7406d705bc33…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 09:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f4fcabff98273cdc9ce959ddf099f46 SHA-1: eb8327491e45d11a66646aa47d75d3ecc80b4ae3 SHA-256: 1d6c7406d705bc33f7052ae43d1760ed0b16ac1a26bf51d724fd92fa226746e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and numerous unknown reputation URLs indicate a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://thsport.dk/ckfinder/userfiles/files/46464705345.pdf In PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/bubijegexikeru.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/zugek.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/tiguvizutobiguz.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109091448499779.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161321942b52ae---49425774298.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/53388822312.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/69883226208.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148220c7c517---93703747745.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/82142547330.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210916/210916021040224094n1tj5ynp6amx.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/lezosepa.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/41482666992.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/82304827244.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/71915099778.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/22143086268.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/rewunilexusasiz.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210906_133325.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/nazugekivakezevis.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/15017314266.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/14400005048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+web+browser+on+androidPDF 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_off0000d47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 18004 bytes
SHA-256: b07eddd8aee334b8e93621f95c63840b115b027ef5a95d0fcae022649f6b3f25
font_01_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 10516 bytes
SHA-256: f723c042252543b68ab4d2fed5208c29713e42d85467ca6cc861c23e69ebb49b
font_02_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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