Malicious PDF — malware analysis report

Static analysis result for SHA-256 89575532c2b73866…

MALICIOUS

PDF

81.5 KB Created: 2021-01-13 09:21:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 17cca64172fa79d42d2b2da0636cb903 SHA-1: 3f915747ad944f71e7da55d396c27601120fa1aa SHA-256: 89575532c2b73866756932bfdcd0b7b3953f99b0d444512440b09ada55efd13e
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=central+vs+peripheral+route+to+persuasion'. This indicates the document is designed to redirect users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://cctraff.ru/123?utm_term=central+vs+peripheral+route+to+persuasion In PDF document text
    • https://site-1174236.mozfiles.com/files/1174236/nitro_rc_trucks_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/UjcuEqV/first_heartbreak_thought_catalog.pdfIn PDF document text
    • https://site-1167955.mozfiles.com/files/1167955/new_berserk_news.pdfIn PDF document text
    • https://sagoxanoku.weebly.com/uploads/1/3/4/3/134350044/xemebi.pdfIn PDF document text
    • https://site-1167973.mozfiles.com/files/1167973/jubedagiwawirodobofer.pdfIn PDF document text
    • https://seriraradekabas.weebly.com/uploads/1/3/4/0/134016679/sajakudapov.pdfIn PDF document text
    • https://site-1177386.mozfiles.com/files/1177386/wefowogonawegubumuwilatak.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/screenshot_android_htc_10.pdfIn PDF document text
    • https://site-1178570.mozfiles.com/files/1178570/livijeborezosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rebomedug/early_breast_cancer_esmo_clinical_practice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/la_belle_au_bois_dormant_histoire_originale.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_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 4872 bytes
SHA-256: f6b389421404efd189b50a2d5f9b57792776f4943b3c76914c569ab7eb41d1a4
font_01_sfnt_off00011492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 10612 bytes
SHA-256: 366f54ab160c9be840f0260e52f6c014bbc35fadd2528d8f353f3abbf02c8aff

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