Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed80c48e03a842f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 11:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6112029ad5484b2b47234f6fe59a30ac SHA-1: 573294aa0f30264f2f46b5a48805b0e70c8ba77e SHA-256: aed80c48e03a842f3c0f57822ed3d4cb363080d41b5b4ea8d1b4440c075158cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/74265246635.pdf In PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/40003776069.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/depukus.pdfIn PDF document text
    • http://exim5.hu/_user/file/lavasatoludafe.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/wexawopodexe.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/17472246244.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/durumibapapu.pdfIn PDF document text
    • https://kimansion.com/uploads/file/ropagalebu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dgk40a7nj40lks93mepp78m516/jikavosebefugakixowosedu.pdfIn PDF document text
    • https://dukupahit.com/contents/files/36855455067.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/34857197542.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/kepoxuwumi.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/raxunipisuga.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/vezikivolelu.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/36543526947.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/rupifazuvujananuvek.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/wasinigivapufina.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab8031082---xibaremidesedagu.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/45356736107.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/95692694714.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/supogifoma.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/15250940163.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/75749310207.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/66967532016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=my+phone+ringtone+downloadPDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210909/16311933049066.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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 17920 bytes
SHA-256: bc8d9427877135ca33847f121dd1956885464978ded0af48a68af7dc22d4c03a
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 10696 bytes
SHA-256: a3d27ad8eabf85705d5c77a0dcb37a335b200c43f076a202f048fcca48e544c3
font_02_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1