Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed3b6b531e27bda…

MALICIOUS

PDF

71.8 KB Created: 2021-01-27 13:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: da36197c986c49bbc6ac0d5dfd197e79 SHA-1: a56f7a1280116db59a799271b1f8cb4f914894c1 SHA-256: 2ed3b6b531e27bdabe70fa2f4dee39a4ba4b2f282224822e3633f3a3d4ba0cb3
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://traffmen.ru/wb?keyword=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C%20panzer%20platoon%20%D0%B2%D0%B7%D0%BB%D0%BE%D0%BC%20%D0%BD%D0%B0%20%D0%B4%D0%B5%D0%BD%D1%8C%D0%B3%D0%B8 In PDF document text
    • https://babixugopanodip.weebly.com/uploads/1/3/5/3/135382952/9fc80df.pdfIn PDF document text
    • http://zedukibawubige.22web.org/telugu_video_songs_websites.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426409/normal_5fdf772172a16.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/bitdefender_internet_security_2018_software.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464532/normal_5ff8b452ee533.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/sisekasepe-lawisizawinutan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470228/normal_600af0d903348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dilabopitomosif.epizy.com/nekopitenozoduparobotaduv.pdfIn PDF document text
    • http://rugeritubaduw.epizy.com/english_conversation_topics_with_answers.pdfIn PDF document text
    • http://lolofekigosot.epizy.com/komuvijoxeli.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/51367529984.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/free_santa_letters_from_north_pole_template.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/72568338546.pdfIn PDF document text
    • http://xuxamasisovuku.epizy.com/sewodugi.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_off0000ccaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAA 6200 bytes
SHA-256: 50ccaaf04dfd7fc7eececd0a314db6cb9737c44c7eadd3d135eaee86b8d3d111
font_01_sfnt_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 15240 bytes
SHA-256: 1796b5f0c68ee0d51951646ab7bc2dce015f3f323a2187f2393257e865f38973

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