Malicious PDF — malware analysis report

Static analysis result for SHA-256 4541bd1d6cc92d51…

MALICIOUS

PDF

69.9 KB Created: 2021-03-09 23:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b0ae6234dba39a19f601f52637a6f7d3 SHA-1: 7396e6ca6a6cd6915bf6dd93e99cab8a9d251649 SHA-256: 4541bd1d6cc92d5180e8e4f2265b28506757240c5cdb176557df272923edde83
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary purpose appears to be SEO manipulation or phishing, leveraging the document's content to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://kuzutuzo.ru/award?keyword=tremble+mosaic+chords+pdf PDF link annotation
    • https://mazakodavowur.weebly.com/uploads/1/3/4/3/134335882/vowukijam-zuwek.pdfIn PDF document text
    • http://best-store.club/35319074310n19ga.pdfIn PDF document text
    • https://cdn.sqhk.co/wamamuli/XMihfgc/ketazelal.pdfIn PDF document text
    • http://boxberry-24.cc/krugman_economics_for_ap_answers1n3oc.pdfIn PDF document text
    • http://menformula.xyz/estructura_interna_de_un_texto_descriptivonotbt.pdfIn PDF document text
    • http://opt15.ru/92720124460y767a.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/besovulajor_kowonukizokowum_jabowogupu_newefapet.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/9NRgemZ/66742501268.pdfIn PDF document text
    • http://mrt36.ru/wormax._io_videos_de_prow3vru.pdfIn PDF document text
    • https://xoxefalumigak.weebly.com/uploads/1/3/4/5/134527234/puwapedut.pdfIn PDF document text
    • http://makedctl.site/spanish_reading_comprehension_worksheets_high_schoold6pul.pdfIn PDF document text
    • http://requiremcgood.com/marimosudssi5.pdfIn PDF document text
    • https://borotopod.weebly.com/uploads/1/3/3/9/133997632/remow.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/Qiayto3/ratonarejerafuriwe.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/ae840508-5016-42f1-a08b-49ca931dcf16/index_of_power_book_2_ghost_episode_6.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_4332f26d41c0428eada101fee68cc33e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fac687d-96aa-4ef3-8490-9aee5c1e1ff8/64445911266.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_54ff756a22144a2bbbd922056b639bfc.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_ea687416e3124b66b918f882987b46a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/064f8cfd-8755-49df-b4be-11d2955b3234/31968934892.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_off0000d63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 5484 bytes
SHA-256: aa4894dd35e3f7d1121639396412ba47608f783ca0636bc4de329602d95f5946
font_01_sfnt_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 9928 bytes
SHA-256: bcc3c479e31f0e522eeae26e535e15c63215574585992b602387df9be96e2da2

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