Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b895c17e245651…

MALICIOUS

PDF

84.1 KB Created: 2021-02-22 23:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 40d3da54affbb3ea7f18f519ac9b52b5 SHA-1: daeaeab2205b7487ace8cb71c038600dcf088442 SHA-256: b5b895c17e245651ddb45aba38cd7f04051ab5ad02646228c9c9ef165f208554
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jacksth.ru/123?utm_term=matthias+quotes+six+of+crows PDF link annotation
    • https://kisisixixugejo.weebly.com/uploads/1/3/0/9/130969502/sopuvulepogupovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5fd3849c229f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5fde404086522.pdfIn PDF document text
    • https://mivewuwadomabat.weebly.com/uploads/1/3/1/6/131606259/828081.pdfIn PDF document text
    • http://wurijudopala.22web.org/junamonolelavo.pdfIn PDF document text
    • http://strahauto.website/fluval_306_canister_filter_mediaac1mv.pdfIn PDF document text
    • http://penerete.66ghz.com/ncert_app_apk.pdfIn PDF document text
    • http://ipoteka.net/how_to_show_diversity_in_the_workplace6d5rc.pdfIn PDF document text
    • http://sreview.online/saxon_math_grade_8_answer_keywtyju.pdfIn PDF document text
    • http://runatem.66ghz.com/vz_navigator_app_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_5fe881909c005.pdfIn PDF document text
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/4121933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447466/normal_5fdf9208185f3.pdfIn PDF document text
    • http://alcexpress3.xyz/computer_hardware_interfacing_notesg1ql9.pdfIn PDF document text
    • http://wegansit.space/please_answer_your_phone3iih2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tabumuxiwuno.rf.gd/beeer_app_2018.pdfIn PDF document text
    • http://furugavasipif.epizy.com/eso_maelstrom_arena_sorc_guide.pdfIn PDF document text
    • http://jizabimumonox.rf.gd/vshare_helper_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/psd_to_with_text.pdfIn PDF document text
    • http://wedowif.rf.gd/gone_michael_grant_audiobook_free_download.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_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 5228 bytes
SHA-256: 18cddd02b4ff913bac2919f5d15d0a0d2679a43726a7fcecd32e9977bfc35c65
font_01_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 11532 bytes
SHA-256: 9240c0c9c8bdf2b3e4262295989b78ddbc4aad8677c7b6696ad194d4fdc13c7e