Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e2e3875120ae09…

MALICIOUS

PDF

76.0 KB Created: 2021-02-05 00:35:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 936cbd54167ac94b735ed8079016a3e8 SHA-1: 17f5445de4ee208dcc268b66894f3665207f0b3c SHA-256: 55e2e3875120ae09cd382bb99ce8704a3aa8340b268f2e6e69676a29cddcc842
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to lead users to compromised or malicious websites.

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://seumenha.ru/123?utm_term=el+laberinto+de+la+soledad+resumen PDF link annotation
    • https://cdn.sqhk.co/pijajawopoji/ieGeBgf/brain_balance_achievement_center_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/ijidAhg/25388445875.pdfIn PDF document text
    • https://xiwupegolowiba.weebly.com/uploads/1/3/1/6/131606046/lezilalonet-nuzovu.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/fgjifih/41691827490.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/5oiggjf/reina_theme_park_apk_download.pdfIn PDF document text
    • https://rajuputodetu.weebly.com/uploads/1/3/4/6/134682309/vukex.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/shaPjfU/worms_snake_zone_io_battle_profile.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/fjf3OLV/24957680530.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitosorav.rf.gd/52857949645.pdfIn PDF document text
    • http://susodiwur.epizy.com/persona_5_magistrates_patronage_answer.pdfIn PDF document text
    • http://kepipejesa.epizy.com/96294755311.pdfIn PDF document text
    • http://gavojomizam.epizy.com/my_aged_care_assessment_manual_march_2018.pdfIn PDF document text
    • http://puzujudu.rf.gd/takejurofusukir.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/looking_for_your_name_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/bollywood_movies_in_300mb_mkv.pdfIn PDF document text
    • http://kazaxese.epizy.com/accountant_movie_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/video_er_for_pc_idm.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/gixip.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_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 5068 bytes
SHA-256: c763098d4d3f33d505f516086ecba93bc6afc2e8a2fa618cea74951eb5db5588
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 10888 bytes
SHA-256: c27143f0454801e7cbca7e0d97c20d6c2ccad7d6dbf0f4cc52852a18d73de39d

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