Malicious PDF — malware analysis report

Static analysis result for SHA-256 86baa5d6614714f8…

MALICIOUS

PDF

94.9 KB Created: 2021-05-27 15:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 59d4c7b0bf4fd910029f95e842e1a5a4 SHA-1: 32bccf536af7d53c2853fca2fad6b3d4c42eef95 SHA-256: 86baa5d6614714f89d6e2e40e72c60427097792c7cda6cc12ce70d16a254b019
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/strik?utm_term=transfert+thermique+rayonnement+exercices+corrig%25C3%25A9s In PDF document text
    • https://static.s123-cdn-static.com/uploads/4424996/normal_5ff8c1bb1fa6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_6064618dabcda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_6012cd970671d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_603440b5b741a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_6056e30f6a2a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_606c090915d44.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/ranojow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5fd09a4761664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5fc5f4c00d9d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_6066c13db2443.pdfIn PDF document text
    • https://kisupijun.weebly.com/uploads/1/3/7/5/137502160/kujigubeguji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/44bb65d2-e244-4125-9574-8178dca12556/napco_gemini_1664_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380c5e4e-c0e9-4314-b456-908abe9fe723/irobot_roomba_655_robot_vacuum_cleaner_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2702b5b8-5e1f-4aae-a6c7-09b644ee9fac/voets_principles_of_biochemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b486f26d-143a-4aa4-bf99-ebae69588b1e/how_to_do_internal_audits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5572747-2b36-4003-92aa-d76404efe1c7/nurexujedupijoluwemure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e710152-868c-4653-8908-8365b87e0089/54460763134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce50d1e-320c-4554-a678-6b230a210271/dasikebedefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b124fb-f553-4913-bec9-7722a54948e1/46012871698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1cf89e-2072-4459-9c1a-660d75f19e49/porisozuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817ea1e0-8dcc-4657-8f54-e684dfa78f84/cuisinart_little_pro_food_processor_parts.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 5652 bytes
SHA-256: 29a2e0a885df68e7a36050e3c637b2660f9eb090bc24125ac461db861d50cd4f
font_01_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 14148 bytes
SHA-256: e196c69a2bdc64596781bbd7b4387922caef54a9473543ee41d14a18a6db29aa
font_02_sfnt_off00015603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15603 16136 bytes
SHA-256: be55bb759cecb0f764b80cd4e0c9ab373909be42783b5cd95b70cbd4acbd3f00