Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c4e6639181bf65…

MALICIOUS

PDF

73.4 KB Created: 2021-02-18 16:34:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c4881078e56ef3f068a618e4857b8e48 SHA-1: 21da73331d225baa0d98d5ecef7e92ac54b172be SHA-256: 38c4e6639181bf6516b0c29b1fbc6c6c375ca96ddf27063f5f6748e77d388ca5
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=the+secret+hero+rhonda+byrne+wiki In PDF document text
    • https://cdn.sqhk.co/mugolino/iejafjf/wakukeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_600ac8f303784.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/jcjedVw/major_mayhem_2_gun_shooting_action_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/ageji5r/rope_ninja_hero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_600cedb32168b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5fd78f874bbb3.pdfIn PDF document text
    • http://sudenusona.66ghz.com/wapunapobupexut.pdfIn PDF document text
    • http://podipotekoi.ru/47724054116vjndy.pdfIn PDF document text
    • http://mebesovinu.22web.org/evaluating_advanced_functions_independent_practice_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/rujosupatebu/1idinhj/fafusesivomul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_60038e9643cc6.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/ijjD4id/83255030492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rezopaduj.epizy.com/18542532110.pdfIn PDF document text
    • http://latosenepodukum.rf.gd/blackmart_alpha_old_apk.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/lepezesat.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25F 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 5344 bytes
SHA-256: d169d84275ff071bf8a0c3244a96afc414b258544a339d42ba473e943d7c8be4
font_02_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 10376 bytes
SHA-256: afd210d07d329206996d16922e03df84430ce2eece6b5cad1e8713a149abc8bb

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