Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e2a3fb2389b1ea…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 11:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: becff2e63fbb92933ed714d6f42fbf0c SHA-1: 0c1778147336d19f59b3358030f308aca4e1e18d SHA-256: 24e2a3fb2389b1eac44307b2abe14bb2f4847f1a28d8674565226459caf61bbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic identified it as a link farm with numerous distinct hosts, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://art-lan.ru/uploads/assets/file/kulinonozovofomewobupiseb.pdf, are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://art-lan.ru/uploads/assets/file/kulinonozovofomewobupiseb.pdf In PDF document text
    • http://cke.hk/userfiles/85069986131.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/sumagafaverosegefibelil.pdfIn PDF document text
    • http://alvitraders.com/files/1256859989.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/60118605189.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/vibobatefadonuru.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/92420520735.pdfIn PDF document text
    • http://coolscape.info/images/files/togimimapusigeveri.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/44865807193.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210910/file/16312999643759.pdfIn PDF document text
    • https://aokman-drive.com/d/files/45668190851.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/zobabejukonetifi.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/vevefosuvudiribu.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/14538899314.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/kekitovegu.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/vegalugajoxon.pdfIn PDF document text
    • http://annabarons.com/files/files/lirifufobito.pdfIn PDF document text
    • http://lgassociates.in/uploads/93919072354.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/91824328219.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/53058523854.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/jetakatup.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/vadujugoxudir.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///rasudufuwoli.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/mowoxoturuduzomupaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=a+quiet+place+2+on+primePDF 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_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 17976 bytes
SHA-256: cd275c582c2f5a898fc0204733da1f650cd3a2d04d7fc004dfc41667a0e5a06a
font_02_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 10712 bytes
SHA-256: 7579b027888dd5f9e7dc351b76a911b07c932741bc558341a4a1dbac15481912

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