Malicious PDF — malware analysis report

Static analysis result for SHA-256 c524828b2cac655e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 15:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0bf4829c9c8fcf971ec6be3eafe5205f SHA-1: 4d92136113d5bf873e4f0e22f4e9f4adf930609e SHA-256: c524828b2cac655ed2307dd4196d9bc102c81619ba21759f6cd4c38443deb7fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=free+wonder+skin PDF link annotation
    • http://midesignvn.com/uploads/files/rematova.pdfIn PDF document text
    • http://zerosquareonline.com/file/27417463879.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/rewaduripedavekilumozi.pdfIn PDF document text
    • http://camonetinternational.com/files/file/kanevubukofosapufatujit.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/zudowugekenonopisituze.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/61693946611.pdfIn PDF document text
    • https://siroyensao.com/upload/files/bisolifavuw.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0jaln1fomom2ajmkh2tt793kvh/81256204679.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210922_F5476C0433E8EB4A.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/51035759874.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/jupopedofubav.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/67461295533.pdfIn PDF document text
    • http://poliinc.com/upload/files/6050682603.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/47125547287.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/7415044130.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/wozakuwunenaxot.pdfIn PDF document text
    • http://gardatrans.com/content/Files/95474354645.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/fenerafuxiwakup.pdfIn PDF document text
    • http://halmar.info/userfiles/file/47043757017.pdfIn PDF document text
    • http://onlinevay.com/upload/files/48932155599.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/kopurigilipijepom.pdfIn PDF document text
    • https://tebra.si/userfiles/file/84413960637.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210919/16319879838037.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB134 10092 bytes
SHA-256: 3294492e8354f2cffce49e53989e9541ac89fda6abc7e30f7d0550f20fc74379
font_01_sfnt_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 18304 bytes
SHA-256: 01592a90bf79f3432447dcdf913611b686b7fa6ea0f8a7cce04b660a9c61b1dd

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