Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec23e570ce44340…

MALICIOUS

PDF

77.2 KB Created: 2021-02-22 04:10:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dfc2dffe0e9a6c75c1f8c309e4bd5f99 SHA-1: 91167a11fbdb4965c70c3d8a97ac181cd55694dd SHA-256: 4ec23e570ce44340af1ec690af4edaf0ab20326e16332ac6b989bc822f6b04af
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/wix?keyword=garuda+ex+guide PDF link annotation
    • https://cdn.sqhk.co/towinomer/Qn6Baif/66371283099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_6009e1a0b39e2.pdfIn PDF document text
    • https://tabodixab.weebly.com/uploads/1/3/4/5/134585887/xofegof.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/7EQVo3I/unicorn_chef_cooking_games_for_girls.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_601edc194c20b.pdfIn PDF document text
    • https://gukofatupov.weebly.com/uploads/1/3/1/0/131070505/bigaperivuru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_5fd67f5dcfb28.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/k6ZgjWN/warlock_apprentice_novel_full.pdfIn PDF document text
    • https://gamekesilib.weebly.com/uploads/1/3/4/8/134892139/sarukevowitiri.pdfIn PDF document text
    • https://xowanejizaki.weebly.com/uploads/1/3/1/8/131871556/setojakagejugav.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/ce1JNk7/vilaruzuvunofipufuxubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5fe81922e7cea.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/Hzh7jg9/wutamikugutujijubumokoris.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tozoxuzev.epizy.com/fonujaxebajewexozin.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/6585501482.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/partners_group_global_income_fund_fact_sheet.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_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 4880 bytes
SHA-256: 3d2392b69ba38f64366be4f880d01bfbc3eb498b7b9f79b05b2f06eaa8a880ea
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 10556 bytes
SHA-256: 4dfda51aac05ad7c96bc98a29ea2f12bb374e1632db515dc167b31dcd8db57eb