Malicious PDF — malware analysis report

Static analysis result for SHA-256 9841ba615b999e8f…

MALICIOUS

PDF

76.4 KB Created: 2021-04-03 19:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6e9b75733079941675dbb29492cc5cf3 SHA-1: 1b09ee80026e4b1d4a124014d721924339437892 SHA-256: 9841ba615b999e8fdaffb543d287586eb6d76fb36326384663286f22e39585fd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nipisod.ru/award?keyword=fusionner+deux+fichier+pdf+gratuit PDF link annotation
    • https://cdn.sqhk.co/jogepirar/PSHsjaq/tudejawuvomo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451556/normal_5fccf54f7e404.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/w9hicgj/chb_full_form_in_teaching.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404285/normal_5ff416761722e.pdfIn PDF document text
    • https://cdn.sqhk.co/gerukoso/fahfThb/facebook_login_html_code_playground.pdfIn PDF document text
    • https://cdn.sqhk.co/wawerugile/r2ieAjb/dancing_line_2d.pdfIn PDF document text
    • http://cleanup-sale.site/what_is_metaphysical_poetry_in_simple_words3kmed.pdfIn PDF document text
    • http://yachts-4-sale.com/24405480524d0nro.pdfIn PDF document text
    • http://esclub.pro/world_boxing_challenge_cheatshtolu.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/icahdij/easipay_mobile_banking.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/gg0CihE/apple_icloud_photos_app_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/69459941576.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/kogumib.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/twilight_breaking_dawn_part_2_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_0689c82caf3b45cebb539da370b27dfd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kabisebax/brother_printer_not_printing_black_ink_on_paper.pdfIn PDF document text
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_6a19c7b5adad4fa58bf01bc96bd8ddde.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_4386ea54481849bb8a874f989f28ca06.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_0b43a292369645009e4e9b20036baa0a.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_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 5408 bytes
SHA-256: c9ea07bbfb78d86de7bd03bbe58f54b1ec1dcfaaa930e87e0b550525516e6a42
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 12232 bytes
SHA-256: a368d904a835b6ef256f000886f5be679db5db2bb71d7c4331dc911551952ebe

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