Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87ff561447fcd41…

MALICIOUS

PDF

68.9 KB Created: 2021-03-28 10:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c4b220cc89f4ba8e94795dbe0b4622f6 SHA-1: 5baaad8216ce257ff42e15b9633d15aadde0ec09 SHA-256: a87ff561447fcd41b8a8c6f1da35cc799ef95b436f4fb808b5f50db84f67b271
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://gimoguvi.ru/award?keyword=adobe+acrobat+pro+pdf+word+count PDF link annotation
    • http://mivibowefumar.iblogger.org/iso_13485_quality_management_system_template.pdfIn PDF document text
    • http://detonic-official.website/okami_treasure_guidesa8qa.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/zibisafopupipuzimogo.pdfIn PDF document text
    • http://beach-fruit.fun/40470660040unwyr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_60372622927fe.pdfIn PDF document text
    • http://specrazreshenie.com/romantic_novels_free_download_sinhalawutta.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/84005027142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408993/normal_6004b8fb92736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_602934b58cc2b.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/70892031230.pdfIn PDF document text
    • http://springwin.space/palijolozatippshuk.pdfIn PDF document text
    • http://chuvashovfamily.ru/lire_le_ralisme_et_le_naturalisme62uga.pdfIn PDF document text
    • http://vutajazelige.medianewsonline.com/weekly_calendar_2020_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawozenagi.epizy.com/86266912517.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/service_cloud_consultant_certification_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/work_related_stress_policy_template.pdfIn PDF document text
    • http://laroruteze.epizy.com/fishing_rod_for_big_catfish.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/asus_m2a-vm_hdmi.pdfIn PDF document text
    • http://mavadapeganitew.epizy.com/don_juan_tenorio_english.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/ashab_e_kahf_story_in_urdu_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/nelupuvefomotufe.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_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 5160 bytes
SHA-256: 42abaa84ec7d62cd45abf5aa7f075d5c1eae144249d304beee3eb9bfc1f45b7b
font_01_sfnt_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 11376 bytes
SHA-256: c90a6c1709918387ec813ddfc1d88e2cf9d4f98a6172bdcf25369b8343468cbf

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