Malicious PDF — malware analysis report

Static analysis result for SHA-256 576d5ac339f5c236…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 14:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 216d49a3884fa0307e5a4fc002040975 SHA-1: 62469019b9d3f8a9bc21bc14b78652b7c88b8b0d SHA-256: 576d5ac339f5c2362a791928741bd9ca7d139e27d94cc2f823ce7332f75edc14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files, indicative of a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://etkindenetim.com/resimler/files/3015993574.pdf In PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bejofuvarowarejelemu.pdfIn PDF document text
    • http://artediapharma.com/upload/files/17467798725.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/zarijunamiba.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/95547893639.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/40246275069.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/kotizozolam.pdfIn PDF document text
    • https://msvadba.ru/files/file/7525152336.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/97002502574.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/81210436880.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/rulakokebibanek.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16132b52cd535a---nabipoxixasazudotukelode.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/xivixejibinajilezidis.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/titubugula.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/vozisepadefexopoved.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/98007106401.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/39179962704.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/88147002901.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210908190126.pdfIn PDF document text
    • http://lochoanggia.com/upload/files/30333154789.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/59209016801.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/77016241454.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/k32aslqr8123rhs0o1e7id9pi9/boroxovape.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/86898448273.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210913/file/16314910987194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=twilight+breaking+dawn+part+2+full+movie+online+freePDF 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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 11344 bytes
SHA-256: b1fb95ec9288a79fa6ee54b64cf7c646ea470503ab81314454d0d63d02b60ed5
font_01_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 18016 bytes
SHA-256: 6d65f4d1a14f7cea020a2a86a9f6d0416f8acdff5eda1f59dcd51246038b5ff1
font_02_sfnt_off00012bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1