Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e069b3f8e322d3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 17:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49ebdf80c74d2e32bf05821b68126ea3 SHA-1: 07af6709627c0d1bf1f6f84f6f68cca45c6d4810 SHA-256: c3e069b3f8e322d3c66a3bfbea033297c563e113dd5ffcc01e6b421c2432dab6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also utilizes a link farm with numerous external URIs, many pointing to unknown domains, suggesting an attempt to obscure the final destination or distribute payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://heathrowairporttaxi.website/userfiles/file/58381230008.pdf In PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210909_BD663A82BC2AFC6E.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/91265901273.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/molud.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/65940520559.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/tibof.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/71949784020.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/pukopejolareba.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/69619670680.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/16651832875.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/18517505.pdfIn PDF document text
    • http://popmetre.com/news/files/43267556146.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210906_61D3BB64447D35CF.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/sodubeluwiri.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/xowawepubej.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/42401430467.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/litonakub.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/narasomupegawonid.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/fusunujoserimipizadaxabop.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/tasip.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/47889609526.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wopajugopu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161430c11be18e---67706460717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=name+three+functions+of+the+skeletal+systemPDF 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_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 17304 bytes
SHA-256: 0767cbe92cf77d295a87e9fa065cad1b2ec969b573ff3177b185291fb5c4fc03
font_01_sfnt_off00010ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 10884 bytes
SHA-256: e5c40d996c5370377e809a3e6d625e2dc6aa49ac83abab93e2e68aee9575a39c
font_02_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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