Malicious PDF — malware analysis report

Static analysis result for SHA-256 a998ca63056022f0…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 19:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8192bc755dfbd56b0df3c6958706dacc SHA-1: 836c3551d97cdce6cc06c4d85d22dde5fac7650a SHA-256: a998ca63056022f030101ecbad502b052f712c475570dd99272940efb29cb0ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, with one prominent URL leading to a 'pokemon mega adventure gba rom download'. This suggests a lure to trick users into downloading potentially malicious files disguised as game ROMs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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 https://ketchas.ru/uplcv?utm_term=pokemon+mega+adventure+gba+rom+download PDF link annotation
    • http://riverla.vn/uploads/userfiles/file/jedat.pdfIn PDF document text
    • http://palami.by/images/file/87182083859.pdfIn PDF document text
    • http://sdds.be/userfiles/file/jipobuviriwolidijenubal.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/17820596040.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/44996056593.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/witizu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ad2196fa---93009610617.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/24193013645.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/69206364326.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/woperevoginexiwixaluje.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/rugugujopobiwirezi.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///tatibomosumeke.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/87952365334.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/bomozar.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///76983082627.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/fotobotajufisof.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/buzesonujefikegudapufol.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/taxika.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/sigidiwu.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/fusufesiwo.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/nubiz.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/84253107530.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/mg0eus0bk1tjb91414h5gt24l0/76301272530.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40666506679.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/mifulowigurezu.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_off0000b409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 17168 bytes
SHA-256: 4942a102713fbcbb4735f673c87b8696c86edc0d6ad87cf68e6e78c9f9783cbf
font_01_sfnt_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 10816 bytes
SHA-256: fe0efeb8d1c432a7f7e2e62ff8f92ed6e733b4eb526f5f7b5c1be6954f6bff06
font_02_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1