Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d99d4bfce8091a4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 06:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93b1e1e056ef0371a94599a107c8a355 SHA-1: d7d1b780efbda49798e3b5be7dab3a81f79a948e SHA-256: 4d99d4bfce8091a468e40ef55425098609a58fe30b7e8e717c6611813d2893f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to various domains, many of which are associated with link farms, suggests an attempt to redirect users to malicious content or phishing sites. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://mywymc.com/userfiles/file/wanomerog.pdf In PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/66434551377.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/furadususalu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cfaafbb72935d61558c84b1f1db2409/turekimuxodadesikilawoda.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/10348797339.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/rogupefiparufijujunudega.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/5192058876.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/35442769876.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/gojunigujaburugopetabu.pdfIn PDF document text
    • http://fourfoods.com/images/files/23400089372.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210912034837_129408817.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/80043071054.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/67111162904.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0pepsl6na7vrh7vgsfp3bj1lh1/86084429060.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/92724047645.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/makejim.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/16519408620.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/rirobisezuwexaginurejo.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/45884950766.pdfIn PDF document text
    • http://chineseclothingonline.net/File/mapisurezosup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=apollo+client+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_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 10320 bytes
SHA-256: d764bbde9d8a1e3f5fec10f3d94b08d57a6152548323b2e5e1e88ba5b399a04f
font_02_sfnt_off000114c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 18524 bytes
SHA-256: 8e443dff771a3e39a9cdaceb84385edca0cc1fc0760e544aea9006b31756f30f

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