Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8a13c4e927b4a6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 09:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b649bf894d66a75835f3638aba1eac4 SHA-1: 62938b0c621dcad181f97d1a5b8c6c2b5ed60582 SHA-256: 2d8a13c4e927b4a6d2aeb37d947603882bd3ca191b1eaf71fa1294f47ac9ada2
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=n+se+english+word PDF link annotation
    • http://scuderia512.com/js/upload/files/zeketikap.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/51944670536.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/30002287478.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/81812489480.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/vewero.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/91636944809.pdfIn PDF document text
    • http://budka39.ru/files/60308958811.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc4c50a04b---70295451395.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/papurabiboxolatuziwatuz.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/bajubup.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/83966312476.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/99572312312.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/pazix.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141ffd6f0388---14541655739.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/95700194223.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/petudadewomo.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/jofuwowafevovefegesirupa.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/rejazabewofubunef.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///49976219438.pdfIn PDF document text
    • https://lordoptika.hu/files/files/nifazonatobiw.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210901092731.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/togifelopi.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_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 10332 bytes
SHA-256: d0d5017dd88fd259113d911362f528e4139c405e162c45ec39e2dbb533dd1c0e
font_01_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 17760 bytes
SHA-256: 90774a15ae45dbef1361decff5e9fd8672946e185509e4856f257a23f1fd2fb1
font_02_sfnt_off000126a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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