Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a41f871a2935d8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 12:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3205b523c26c28404f6dbaed57f7d6d SHA-1: 1d00755989c051464e6fc99a8ecd956118a05125 SHA-256: 26a41f871a2935d82aa971b139ee87ce284298a8f476fb9589f944025c086ebe
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the structure and numerous external links suggest a malicious redirection attempt, likely to facilitate initial access via spearphishing. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 4

  • 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://khautrangkhangviet.com/upload/img/files/gufomuzikijeko.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139508f46c---89680073201.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/kubofawiket.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/woxasesuwir.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/tawowibe.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/77044749888.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/riwobetemaz.pdfIn PDF document text
    • https://ewt.cz/res/file/75288951719.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/vevuxugasogufajowup.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/87653667100.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/wibidajavo.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/kokapepazefug.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/dujekudojak.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/visebelagebudoridajibo.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/29450026377.pdfIn PDF document text
    • http://kisito.com/userfiles/file/jufav.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/81600887693.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e885282ce---38064878346.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/gemufikomatafowogoniguje.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/rapatijetom.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/14485042776.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631287239.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/lawiwopufavoredax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+layout+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC374 16504 bytes
SHA-256: 82f3dde63850ec40741eb92c16ac6e60b1d1309a6dfa9ffbb06561c60d61ed14
font_01_sfnt_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 22608 bytes
SHA-256: 930f47d915da1ff45efa744a1bd63ccf37ff5630a3c3062193543409973449f7
font_02_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 10616 bytes
SHA-256: 20ea003cfdec8d5e452da8b4dfc813b9e96539663931603f9f9d54fc01e0ba0b
font_03_sfnt_off00012b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.