Malicious PDF — malware analysis report

Static analysis result for SHA-256 178426d39e32cc1d…

MALICIOUS

PDF

71.5 KB Created: 2021-10-03 12:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6dcc4daa5578e4e767ea6d5970c73063 SHA-1: cd48551a5e951101236f3bc47835f46b1166c16b SHA-256: 178426d39e32cc1d5da72f209814485bdd766e6fbed3dbf1a4a49351e98fd8e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laptopplus.be/app/webroot/files/userfiles/files/10412122035.pdf In PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/kugalujet.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/relexuwolezuwesa.pdfIn PDF document text
    • http://zamgph.com/uploads/file/022020455519.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/37547932681.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/27656113297.pdfIn PDF document text
    • http://skupka23.ru/upload/m/37476465400.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/sazobevesujujutisijagilo.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/sopuwasenutapifet.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/lojanivanaduzutimixa.pdfIn PDF document text
    • http://bienbao.net/uploads/files/66087821378.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ef71adb1---30422279978.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/pojabejamitiwapok.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/90267466252.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/82080572122.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/sowijujatovu.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/44209236860.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/jatimenekitelirajiki.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/66958408177.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/85463211568.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/92770788853.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/rekesetotirifaruxorujovef.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/53220739695.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/32942479352.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/ripof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=marketing+mix+in+hospitality+industry+pdfPDF 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_off0000b4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 16008 bytes
SHA-256: afcade0edc7267800bd641a03162c949c77d87fbf02d04116f6fc257dc4d1ccb
font_01_sfnt_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 11348 bytes
SHA-256: cef084a1745a8cee12f26d2e0154beea7ca35ea88bfe1eeae13b81f695014a3e
font_02_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1