Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf04a389bc129c6d…

MALICIOUS

PDF

77.5 KB Created: 2021-02-25 10:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6f32e0fa4759c9c9f59622445baf24b6 SHA-1: 1d58a96f5b3425ebecc0040618de35e603784c1e SHA-256: bf04a389bc129c6dc13eaad5430bc90b14820b5ebdac6c2dc8d08f08fa0b60b3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to '2003 honda civic maintenance schedule' and is generated by wkhtmltopdf, suggesting a lure document. The presence of numerous embedded URLs pointing to disposable hosting and potentially malicious domains reinforces the phishing or malware delivery intent.

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://yafferge.ru/strik?utm_term=2003+honda+civic+maintenance+schedule In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_5fd2e7f2af69d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379240/normal_5ffb306d417aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387938/normal_5fde3b0a04439.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/kijhehe/85532101221.pdfIn PDF document text
    • https://vidolatukala.weebly.com/uploads/1/3/5/3/135316506/sudojekupev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375896/normal_60006707ca998.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/jhhfijm/help_the_guy_subway_fun_run_2.pdfIn PDF document text
    • http://blekrossi.ru/xojupobugid6k8i0.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/hwlhihi/gameboy_advance_orange_light.pdfIn PDF document text
    • https://tuvozejuwubox.weebly.com/uploads/1/3/4/3/134323710/fudawarejasob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_6031756402365.pdfIn PDF document text
    • http://mmmuuuue.space/divenewizatugoi6i2q.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/gmgihc7/idle_concert_mod_apk_1._1._2.pdfIn PDF document text
    • http://physcoo.com/html_email_template_sample_code5yoo8.pdfIn PDF document text
    • https://xegoratan.weebly.com/uploads/1/3/2/7/132712572/6986910.pdfIn PDF document text
    • http://store50off.info/houghton_mifflin_harcourt_collections_grade_81qq5o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatasinunevuto.epizy.com/ordering_numbers_smallest_to_largest_worksheet_ks1.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_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 5488 bytes
SHA-256: 4acf77808a7fbbf5b7d0a7baba202f4af9ff64451d1a4f77109648dc2aa30005
font_01_sfnt_off000104c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 10564 bytes
SHA-256: 89d6f9af835e7dd4ce48a5d3106ebdef281fe6615bc78d4261191d9badd827b5

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