Malicious PDF — malware analysis report

Static analysis result for SHA-256 057f5c7b77a1d7e8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 10:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 39e57206c6f6ed9528a972a5fb1ccbdf SHA-1: 469bd10eb654a660fe6b8cd2d14a6687473223d5 SHA-256: 057f5c7b77a1d7e8edcffe0edd8482abe62d7829990fafd78fbfe7c7f62c81e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external link behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=handy+backup+android+deutsch PDF link annotation
    • http://thebodyclubonline.com/userfiles/file/33013780376.pdfIn PDF document text
    • http://surausa.com/uploads/files/62674182692.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/wagimisu.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/20340866586.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/49357952987.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e569d64691---zuzobobatunijad.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914090854330919.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/90592671709.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/keniganulugutiw.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/15895937126.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/91752145060.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091808000971.pdfIn PDF document text
    • http://npas.ru/pic/file/lelabokemokisofememisaze.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/96247499337.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/mebevugonafuwimonel.pdfIn PDF document text
    • https://lecachet.fr/docs/files/89543818754.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/17265076506.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f399221991---9666325291.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/nategejevetojuzopado.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/kebixolegeviwu.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/vifeludumevaxaw.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/3432976482.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/54390190301.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_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 11000 bytes
SHA-256: e5898252581b1b97d67b23dc583bbc2c1770d6c753696c2640f4783f917c4e0f
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 17204 bytes
SHA-256: 73d303715b5d372469f191e9fa598e22400e45b86bd6c3bcc1c02fee2f933beb
font_02_sfnt_off00012656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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