Malicious PDF — malware analysis report

Static analysis result for SHA-256 94512d26f3936547…

MALICIOUS

PDF

92.1 KB Created: 2021-02-23 02:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2591d38ccd906ed1981ae2c1b965abbc SHA-1: 981cc3b8996a7ab7c544cf5b7467977ea1569484 SHA-256: 94512d26f3936547fadca0ac79d019f1a84bbd1b8a6e937b6793df66282eeed2
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://druttle.ru/strik?utm_term=honeywell+replacement+filter+kit+17000-s+-+20500+true+hepa+filter PDF link annotation
    • http://wdd13.ru/the_challenge_inferno_3_episode_1aqzi5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_5fd3156677ae5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481282/normal_5ff344c98344a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494888/normal_60002850d3710.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370737/normal_5fcd3e7dddb5a.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/OBliegf/ding_ding_ding_good_morning_download.pdfIn PDF document text
    • http://ewop.space/doulci_installation_password_v1.0.14qvn7s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450340/normal_60160fd68222e.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuwudedi/hgcHwid/baby_growth_calculator_pregnancy.pdfIn PDF document text
    • http://brosbass.com/fur_elise_jazz_version_sheet_musichmxjo.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/giaD5bV/rush_limbaugh_todays_show_transcript.pdfIn PDF document text
    • http://reflectionss.space/befefuzavujewot1yy5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_5fd927ad69cdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wapemufabaloni.rf.gd/bangla_gaan_ringtone.pdfIn PDF document text
    • http://sikozodiz.rf.gd/online_excel_spreadsheet_editor.pdfIn PDF document text
    • http://numebazo.rf.gd/50482223788.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/hyrule_warriors_definitive_edition_100_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/ffxiv_lanner_guide.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_off000126c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 6036 bytes
SHA-256: e5a8ea2c76e65c50bb2bead95acde6c1778f39aa08a7df1aa27b7e15154e8f3c
font_01_sfnt_off00013b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5B 11464 bytes
SHA-256: 09693dc8689cfcef18f71c90e6683d607a60c9477807ad4fb99e53d5249c9b38