Malicious PDF — malware analysis report

Static analysis result for SHA-256 1783988bdf65b803…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 10:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1de76a2ea3eb73048e56586e7ba4742c SHA-1: 3fdc5db1db71e08517fb4de4a0b02c0c70791205 SHA-256: 1783988bdf65b803bab3edfb094e3dac0c349135b9b8c36d5a5249046b793b68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous embedded URLs, many of which point to domains that are likely part of a link farm designed to obscure the final destination, a common tactic in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mgogs.com/mgfiles/file/desegizorudadovuvetuvi.pdf In PDF document text
    • http://ac-kenigsberg.ru/files/file/jisojaratoxe.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/53607963313.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/81392854668.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bevagorexenedelibowu.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/98154076703.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/46433351916.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/42520301569.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/8327638458.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/62213220396.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/jigudujowavolugiro.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-05/images/files/nubinosozuxaw.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/menusunovefunajo.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630634094.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/sawamodu.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39094da22---fefebemikatugoworob.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/sopelawojosolemitomu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/g6sokp22qqg9r0cqitvq74s0n3/10866725008.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/pifupajegidiporufuno.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/61514145313.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/87605099399.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/fomogepujujofofogobemeri.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/30306090014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+uninstall+mmi+group+appPDF 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_off0000ca83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA83 17508 bytes
SHA-256: cc653d65582ff3c4281be7a948f7a1e5e9482178943c3991baf9241987264e4b
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 10640 bytes
SHA-256: e0062ad046ea287ccd330540c9feb548b60a0a945e7f8c2c711e2e511a66708d