Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3fdc1717ec479c…

MALICIOUS

PDF

115.1 KB Created: 2021-04-13 21:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0d98cf47c98fe5a9d65292fc094feb42 SHA-1: 7264925c9dc4fd11f693694c0bb2cbaf8cae8b8a SHA-256: bf3fdc1717ec479cbe11300516ab651c6336b1be0450e42fafd1476fd4db70e8
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs, with at least one identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a reference to 'Star wars thrawn trilogy comic', likely a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=star+wars+thrawn+trilogy+comic In PDF document text
    • https://cdn.sqhk.co/xedopuwuzosa/0lvgjR9/bengali_movie_2018_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_6024bf052fca5.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/n5jaFhf/jimu_app_apk.pdfIn PDF document text
    • http://baderezu.scienceontheweb.net/fourier_analysis_of_time_series_an_introduction.pdfIn PDF document text
    • http://wubujonil.getenjoyment.net/81672851319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458161/normal_5fc60287b036c.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/cjjiiia/gawatofekamumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_6066b03195fcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_603a3e7c69a27.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenelavup/gclAPgf/paxofakegufibupamovawufav.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/inieZij/86507371647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377125/normal_602b8702f21f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabiwilurase.atwebpages.com/bukotoxodopawo.pdfIn PDF document text
    • http://zewadomi.myartsonline.com/52322972459.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/the_broaden_and_build_theory_of_positive_emotions.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_c3e5268785d94383a083a0c3ba9e2813.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_42cd77b9ba304aa49db0713ab4a0683e.pdf?index=trueIn PDF document text
    • http://wugujub.onlinewebshop.net/felufuwokukabodawi.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_c1f468fd85b745e4aa1b6f9298a9e1b6.pdf?index=trueIn PDF document text
    • http://japamitafixe.myartsonline.com/6471999521.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/86791756335.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_3cf9099dd524445da6119c5a6b0b91b3.pdf?index=trueIn 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_off000185d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185D7 5512 bytes
SHA-256: 59ab1f15329047bd172e6c797c7a69107ae327d4c3e6954eba921c0c3b6c4533
font_01_sfnt_off00019883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19883 11624 bytes
SHA-256: 60db0e84dfc060c41754df571e789fce2513f167b9c826a613b8e326f87cb71a