Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bb36dfe1404cc6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 14:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a22132a56e9cb0fcab6071109c614980 SHA-1: 75b5f4d4c97c9ee061aaf9735116f06a60fb9ea6 SHA-256: 38bb36dfe1404cc615ad40e7af4aabd8f2ec5499b27780b51b3df1313649cd42
166 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common tactic for credential theft or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or redirect to malicious sites to achieve its objective.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://hugslock.com/app/webroot/img/files/dumesepebo.pdf In PDF document text
    • http://trevorhannant.com/29516210028.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4qftpft53v8qss8eg0rldcq5c7/wevijenudogexitiwape.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/woruz.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602ed66821---daxetezubidawefuv.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/57752376733.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/94357473294.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/41991644714.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/gifuvopibupovabube.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/81378873725.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/gumikosekeno.pdfIn PDF document text
    • https://tsolisp.com/files/file/31038332889.pdfIn PDF document text
    • https://themalc.org/files/file/40208813474.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/19198941731.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/vosefawaxalamiwisekof.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/mumiba.pdfIn PDF document text
    • https://panama4d.com/contents/files/muxodekulugu.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/27526002745.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/93033970179.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/sozefuzu.pdfIn PDF document text
    • https://breedlife.com/upload/files/pozepelilaxurilufaja.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/gunavumax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+block+a+website+on+chromePDF 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_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 17756 bytes
SHA-256: 6fab988b1fdfb3339e5419494a9471b8922b6b56cf19b55288725cf855b9b284
font_01_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 10944 bytes
SHA-256: 00574401ff50a966086c01640a2b3adf231000d292470f66086bb07bba9599e3
font_02_sfnt_off00011d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1