Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbd745ad0b43595…

MALICIOUS

PDF

74.2 KB Created: 2021-01-19 18:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8c04d390441663d1a88dba0c4029b033 SHA-1: 729a7af6150bbd94bb6fa34e4a023a29ed16195e SHA-256: 4dbd745ad0b43595fddfe984423746ca159b6217cae7fb0c8e5ac24a719e34b5
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be part of a link farm strategy, aiming to direct users to various disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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://traffking.ru/123?utm_term=east+bay+bike+path+in+rhode+island In PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/6521436.pdfIn PDF document text
    • https://site-1248967.mozfiles.com/files/1248967/kabavujixalep.pdfIn PDF document text
    • http://zuragaretezi.iblogger.org/jeketosuwabegitosup.pdfIn PDF document text
    • http://tarenutufitox.66ghz.com/android_box_tivibu_go.pdfIn PDF document text
    • https://site-1083792.mozfiles.com/files/1083792/zowetenapapogikosune.pdfIn PDF document text
    • https://site-1176622.mozfiles.com/files/1176622/hutchinson_island_beach_report.pdfIn PDF document text
    • https://site-1177051.mozfiles.com/files/1177051/fruit_vegetable_carving_images.pdfIn PDF document text
    • http://toteganutiv.66ghz.com/67929681721.pdfIn PDF document text
    • http://fajutixosisi.22web.org/22832249407.pdfIn PDF document text
    • https://site-1203095.mozfiles.com/files/1203095/51691310919.pdfIn PDF document text
    • http://jodesomuxuduzu.22web.org/2699830675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujebudavitasoz.epizy.com/gerek_hzl_araba_yar_apk_day.pdfIn PDF document text
    • http://riwugenesujo.epizy.com/chinese_flag_coloring_sheet.pdfIn PDF document text
    • http://wisiver.rf.gd/nonadokubixilotisibob.pdfIn PDF document text
    • http://favukimasinete.rf.gd/99613530635.pdfIn PDF document text
    • http://wisunomimat.epizy.com/39196727613.pdfIn PDF document text
    • http://pakafadudu.epizy.com/chhattisgarhi_gana_dj_mein_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/59187493065.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/57807042589.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_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 5312 bytes
SHA-256: b19f64815dddcde7eb62d2af733e8472642eda873aeaa73356b4381d51eba870
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 11340 bytes
SHA-256: 0bdda1ef38f33c2344f2d1dd8bd6f5f8eb10a55e2a7a5b0f142d0232b7813bab

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