Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc09255c7d05e533…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 03:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3ea70f441dfd18cd452086b3b39a0d3 SHA-1: 949fad6d40be83012d9344979768141bd5d67575 SHA-256: dc09255c7d05e5330e26aaed4cbd919c52d9d79b1b76c60711beaf2acc74fad2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common technique of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=numerical+analysis+with+c%2B%2B+pdf PDF link annotation
    • https://mr-alian.com/upload/ckfinder/files/32265435168.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/rupijukejebopomojirejimon.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/ralibiwatatupunun.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/sepagomovurezulezitidiw.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/vesibolufazase.pdfIn PDF document text
    • https://isleo.com/i_photos/file/widesunovazafi.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/zivodokewuwirosodosuwisuj.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/14587200764.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/eedac8312a8cf6e975d115d2ca6e86f2/59466486922.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/95587308499.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/67076351408.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/xosegabonaxonofuzin.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/12883826979.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/73822578792.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/rofoxumaf.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/laligejuzefeg.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/95396606557.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/19344336044.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/wedakalomo.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/kakijuk.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/60270572920.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/27df9910ed3f461a2dc3ab9dcb31cd1f/ruwipixaxe.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_off0000b908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB908 11044 bytes
SHA-256: 5b90d01d679726364929ba56ccfe8be757de688685c52d5e2a543e75deac0b46
font_01_sfnt_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 15824 bytes
SHA-256: 93523244de95f253b5c7de1b5c08f2bc2e1f8f76036126c9ac5edbda3963188e
font_02_sfnt_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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