Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8adcc3da8878b2e…

MALICIOUS

PDF

94.0 KB Created: 2021-09-19 03:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36c22ae3992a907a87ac957d47999b69 SHA-1: ad505e7b326a00d08803077649d2e70a19fa26e9 SHA-256: d8adcc3da8878b2eb2445a31524bb6c634af7476a4db292c329c56b16b06e1cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=10+free+instagram+followers+daily PDF link annotation
    • https://easresidence.ro/app/webroot/files/userfiles/files/61486774301.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/39525280209.pdfIn PDF document text
    • http://spharma.ua/files/file/xibabamugajizobusarapixej.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/41107865814.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/17943264314.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/25937060127.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/reresojujaxeketamife.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/vetaluvepozefogupejatu.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/zekak.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/74232352043.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/69378827595.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/topawofabevagituwitonisaf.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/pokorejuzedi.pdfIn PDF document text
    • http://vswet.ru/f/vosejirusokijas.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/98335661848.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/76799832298.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/jejetajofoluzonatumapop.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/sopikojalivu.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/zinibifimaruduwab.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/kidexobetupizu.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/25948775377.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/mujozijimevudewonojopek.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/vodepodowagumezonupa.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_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 18416 bytes
SHA-256: a3883b0ef447baf1abb944d785cabb542ce616132bcf320ba7a0c948a5effcd3
font_01_sfnt_off0001397b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15192 10972 bytes
SHA-256: a785fb1dd84764ad53213354fd2b58e3932ee2d4baa585c8d1f6a2b23ab2a476

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