Malicious PDF — malware analysis report

Static analysis result for SHA-256 6587c7cf34a9a4b7…

MALICIOUS

PDF

82.3 KB Created: 2021-03-17 10:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44605bf87c71762c8fcfbcd17a434f0d SHA-1: b9e03b426bb6bc277eb4b1b26b87e26e50d7d818 SHA-256: 6587c7cf34a9a4b756987cbd3a9f1667b774f8ac2b405349395b8534f3595db3
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a phishing or SEO spam campaign, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the presence of numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://lozipotod.ru/award?keyword=chevrolet+captiva+2020+manual+pdf
    • http://kulotufiw.mypressonline.com/81121618093.pdf
    • http://zoguzeno.22web.org/ncert_maths_exercise_2.3_class_9.pdf
    • http://gixipures.sportsontheweb.net/mukhyamantri_awas_yojana_form.pdf
    • http://pixidilivutep.medianewsonline.com/31212991355.pdf
    • http://fumuroruzej.medianewsonline.com/best_safety_rated_booster_seats_2020.pdf
    • http://powajaxib.medianewsonline.com/kabujenekat.pdf
    • http://vebowulaze.22web.org/twilight_hindi_movie_full_hd_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/38a627dd-0061-4940-b971-8b65696da98e/65697131076.pdf
    • https://uploads.strikinglycdn.com/files/12a409ea-34bc-41e8-a463-94bf78dbf5f5/alain_de_botton_on_love_book.pdf
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_432d6ad8eda349f2bc2f7914e2e77a0a.pdf?index=true
    • http://marakolin.epizy.com/instagram_photo_size_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/59618500-7fe4-4c78-a03c-7969bac26bc2/exploring_philosophy_an_introductory_anthology_5th_edition.pdf
    • http://xupuwineris.epizy.com/hermiston_oregon_police_reports.pdf
    • http://pumuroxojab.rf.gd/the_absite_review_steven_m_fiser.pdf
    • https://s3.amazonaws.com/gedimuta/canon_eos_50d_software_free.pdf
    • https://s3.amazonaws.com/wazotojemov/why_does_god_go_silent.pdf
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_700ee857b5c2486284e44e3cc884dc76.pdf?index=true
    • http://xidesaso.rf.gd/assembly_language_programming_free_download.pdf
    • https://uploads.strikinglycdn.com/files/7bbe5ab5-ccf9-4359-bda7-1f766f6afcfe/english_grammar_worksheets_for_grade_5_with_answers.pdf
    • http://vutaxinasiva.epizy.com/sejuripipopuzag.pdf
    • https://uploads.strikinglycdn.com/files/d6673d8f-81fe-431c-9004-6670e26d1919/10044767564.pdf
    • https://s3.amazonaws.com/rafiralexezol/fiwipivukofibiputona.pdf
    • https://s3.amazonaws.com/fajeloninesitel/world_history_book_for_upsc_download.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_b15e522e1e7843a399a79d68d521ba67.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103b8.bin
417fe9ac631af078e1571bf76da8a07e71273afc494a37632b0a00d90617f0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 5456 bytes
font_01_sfnt_off0001161f.bin
625b8f3d551dcbe222b6a88fc2a3359ee6f27e55ec3d87ce20b025e2b05a7bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 10832 bytes

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