Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31feaec12a8470a…

MALICIOUS

PDF

41.1 KB Created: 2020-11-08 19:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 03ec2f85ef92e42f9c0f11c49a003123 SHA-1: 11ba76516a182cdb0030333481683825ffe1afb8 SHA-256: b31feaec12a8470abf4f2ce75f945c7a5ae8587b6c3946c6307dad0cfc305b02
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/aws?keyword=worksheet+on+my+sense+organs PDF link annotation
    • https://xotuwajugi.weebly.com/uploads/1/3/4/3/134349857/1254517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f90d9bc3b315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f9271e9ef245.pdfIn PDF document text
    • https://tiralilibixadu.weebly.com/uploads/1/3/4/5/134500138/mepozem_telipanedinudij_banunazi.pdfIn PDF document text
    • https://weroxodadugofu.weebly.com/uploads/1/3/4/5/134503620/nolamaperubetepe.pdfIn PDF document text
    • https://nikokitigo.weebly.com/uploads/1/3/4/5/134500207/6998036.pdfIn PDF document text
    • https://nivozigagu.weebly.com/uploads/1/3/4/4/134439663/pigirijodezisox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/ricardo_munoz_cbt_manual.pdfIn PDF document text
    • https://fegaretu.files.wordpress.com/2020/11/sozosozanozejukubo.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/unblocked_games_66_at_school_shooting_games.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000627e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627E 5248 bytes
SHA-256: be792f7d81000150d9241f02dae192a9d681147e0c3d6d0d085b12bbfbf42678
font_01_sfnt_off00007440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7440 10388 bytes
SHA-256: 49ea4390282b5b28a7c263e58070979b7a7f2191141316695c8b99e8dd8b8c33