Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ac7549fe082ca5…

MALICIOUS

PDF

69.2 KB Created: 2021-02-14 01:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4aa69a69faa8f91030efe224e8c1cd92 SHA-1: 0c80823a88b607012df48469230ba63a8f4b7db2 SHA-256: 64ac7549fe082ca525417aea0d2961ca42b6a18ba7a34ec604342002f28150cb
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one identified as a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that exploit browser or PDF reader vulnerabilities. The presence of multiple links on disposable hosting further supports a phishing or malware distribution scheme.

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://crophysi.ru/wb?keyword=belajar%20gitar%20otodidak%20pdf In PDF document text
    • http://tofabukusakuni.22web.org/admission_form_format_for_school_doc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427514/normal_5fdf894ad232f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5fd1c977c7b47.pdfIn PDF document text
    • https://wokawopirajer.weebly.com/uploads/1/3/3/9/133999547/9dca475dfd41cb.pdfIn PDF document text
    • https://fozaronu.weebly.com/uploads/1/3/5/3/135349809/1ff4c1e.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/xijob_zobasada_ladejukifeper_dazadirazaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500692/normal_5feb33f9b67fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368747/normal_6005b9ec3e14f.pdfIn PDF document text
    • https://gapotijaj.weebly.com/uploads/1/3/1/3/131383657/tapexezizebugif-zubaxaboxogopog-mitotolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5fe6d9d71db6f.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/fejatepudopito/esl_superlative_worksheets.pdfIn PDF document text
    • http://wemubateba.epizy.com/taximegiwosozemiwifozanuw.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/avast_premier_2019_kuyhaa.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/bb_autoloader_10._3._3.pdfIn PDF document text
    • http://sowujakuje.rf.gd/56094122486.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/farodija.pdfIn PDF document text
    • http://kufalogomisag.epizy.com/cowboy_bebop_rush_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/cpa_cpe_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/tutavexeditisagonutotusop.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_off0000d31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31F 5220 bytes
SHA-256: eef00b555f142bef00f3e26bd394c4acc8af495202dc33ce58a84d3c7ebc6645
font_01_sfnt_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 10160 bytes
SHA-256: 6c1b9c5e91769ea64156c2529e198d6ff8c3ef84d5645637165619a640d7d371

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