Malicious PDF — malware analysis report

Static analysis result for SHA-256 301f114232b587ef…

MALICIOUS

PDF

85.7 KB Created: 2021-10-22 14:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1f39364b81c041ab19795f85f840b25 SHA-1: d28281e902a226ed313b5a39405f0c7830a8a5a8 SHA-256: 301f114232b587efe084ba337878c7cf10365c2f0e271f0472bbabbf59a76c99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://eastcoastbiker.de/sites/default/files/file/ziderabomabipagez.pdf In PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/rinun.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/45098120924.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161567f3b5e3c9---34369525981.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/woxojosuta.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/nuvupik.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/movasaxi.pdfIn PDF document text
    • http://damutech.kz/upload/2021/10files/211022164337578332fglgn.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/weberagonosumejaz.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/nitufo.pdfIn PDF document text
    • https://aceold.lrsinc.co/userfiles/file/jawawogaj.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/kibuwaberowew.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16172704192720---1351109813.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/pakabowi.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/dubelu.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/55538091200.pdfIn PDF document text
    • http://yuli-china.ru/d/files/85173714972.pdfIn PDF document text
    • https://tsolisp.com/files/file/xakifiwupukijuwerefadi.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/filujekuzexagumarikib.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/baxiwonuzavigebasu.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/69595265760.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202110172206478613.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/wemonepefudatimasot.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20211005095818.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=addition+of+improper+fractions+examplesPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/3280608949.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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 10864 bytes
SHA-256: d583eec4827f318c86294117e917e09605e23b10a8e1bd9f6ad6ba43c85efda8
font_01_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 18892 bytes
SHA-256: f6899b7140f5bec28bd5f60e295cf66767ea1f8f8aa4833bc80e7a84164ae4d3