Malicious PDF — malware analysis report

Static analysis result for SHA-256 f584e62db62d6151…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 03:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 380e0845028098b41a9f318e9db9fbd3 SHA-1: a96eb7f288bec17d286e7442c912a04e12698b4a SHA-256: f584e62db62d6151bad37d57c25aae176949aea24638dcd82b3a54d6a0232ab3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to lead users to phishing or malware download sites. While no scripts were directly extracted, the structure and URL patterns suggest a social engineering attack, possibly related to software lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://paykaaluminiya.ru/ckfinder/userfiles/files/nukexekajojizetenizugareb.pdf In PDF document text
    • http://technestudio.eu/userfiles/files/xuwidozepukibugosa.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/jafulexofijuxanexulaxopu.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/zarafuwozobesojinijejetor.pdfIn PDF document text
    • http://archbot.pl/files/file/38268899818.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/4429376310.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/rifabiwigov.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/77449002629.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuvatawivumokobeni.pdfIn PDF document text
    • http://moneymaker-gold.de/files/28095790484.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/77036743927.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614644d492ce9---85072213470.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/vugotitugigewepajile.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/zanadikivobufodoxen.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/dexuzoxabuvijagigaf.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/6285088037.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/11364215003.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/46639490367.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/faxomegunimeme.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393951d0571---41759396242.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/katosad.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/7337825239.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/37703155918.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/kagawemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=popcorn+time+latest+version+for+windows+10PDF 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_off0000ca1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 17484 bytes
SHA-256: 72724841b1baf975f57674537e29a9769e9e7f2ea6927fa41ce9e75e0a881564
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F58 11108 bytes
SHA-256: f946c53f3998591a4969490639b3947b19f2be3ebe5dc7539ec82e4d3a72b9ae