Malicious PDF — malware analysis report

Static analysis result for SHA-256 021f8b9080bf331f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 19:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc20a608958038dc92f65ecc930aa17e SHA-1: d44ad9a7e24821d789fecab956da3f63c5794d88 SHA-256: 021f8b9080bf331f152008763994a7370956d83ff47f4f4ec00bd6ec9b446651
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. This structure suggests the PDF is intended to act as a lure, directing users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sensi-leszno.pl/userfiles/file/velutaga.pdf In PDF document text
    • http://varadimasszazs.hu/uploads/files/retoxamusosegetanagut.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091116185885.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/6200920574.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/sudenavun.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/26218091467.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/48511116359.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78369940661.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tewujupopu.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/73408042982.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/migojeva.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/gorusironof.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/92337181493.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/84264239175.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/famimodo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8ebd8065741443ea72b26c3f2bfb0b13/98380741581.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614309d436069---wukekirinuw.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/gikusojopafesakokasisitu.pdfIn PDF document text
    • http://bulmarconsult.com/files/gewupasisidokepituleto.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///59062342161.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/32910155255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=application+bureautique+android+gratuitPDF 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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 18108 bytes
SHA-256: 850e6ef654d7f6a5662d76acccdaf779b5ee0de8bdf08c8b6d0f51499c766d37
font_02_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 10888 bytes
SHA-256: cc79cd81a903339b6fd5a30e8e2e2ee9921e7c5ac89333034dd1b58e9c2674f7

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