Malicious PDF — malware analysis report

Static analysis result for SHA-256 9050f45073a0447b…

MALICIOUS

PDF

78.5 KB Created: 2021-05-29 05:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b4c4f7f739852ac4b6d7a0bfb42781c6 SHA-1: da8785c0ba50869da0651d03e633e6bd7bbfb6bb SHA-256: 9050f45073a0447bda9986c80ecfbd02bbc7a39e71120d4d5d8ad1a0ed15fc70
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 0.9964

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://golowaki.ru/123?utm_term=moscow+nights+piano+sheet+music PDF link annotation
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/zusakom-faxuvuxuwimevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_604f3e034eb3c.pdfIn PDF document text
    • https://menusopam.weebly.com/uploads/1/3/4/5/134597334/putil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478127/normal_5fe527d04366d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_60254319f3102.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/melewutonezifajem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446776/normal_5fcc91d2a8811.pdfIn PDF document text
    • https://xilazugalalurid.weebly.com/uploads/1/3/4/6/134685369/98f279f.pdfIn PDF document text
    • https://lorudopop.weebly.com/uploads/1/3/4/3/134315835/ec713621e427453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425211/normal_5fced2ddda159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_601549a9dea73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fee88548fb46.pdfIn PDF document text
    • https://ratamugokamilel.weebly.com/uploads/1/3/5/9/135959592/0346beed9607403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_6059685f427c6.pdfIn PDF document text
    • https://gumarifubora.weebly.com/uploads/1/3/4/4/134465571/8472212.pdfIn PDF document text
    • https://garotilalu.weebly.com/uploads/1/3/0/7/130739336/0bad444038fee6a.pdfIn PDF document text
    • https://jopuwijexanubuf.weebly.com/uploads/1/3/0/8/130874501/kabiruzam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472753/normal_5febc0c768ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_605ac0f8d5a99.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/7b9db617-77bb-4533-a25b-2e5961ef3693/bellsouth.net_email_account_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/647a77b6-737b-4208-af0b-f650aeab86f9/9770467504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f30f20-dd88-4eed-baaa-417025aae86b/cognitive_psychology_focuses_on_the_study_of_group_of_answer_choices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f837a734-2151-4c9b-844b-8d6aab460c12/84221236148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc4ab77-04f1-4b16-911e-013236c9654b/33894389150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936fc9d8-f271-433c-998c-fdbf1a52fc18/90392179254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4049dc-880d-46d3-97f5-cde62b00fb9a/ribeluwobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fdf834b-a0b0-4720-a517-9211a077efee/86005006249.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_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 5316 bytes
SHA-256: fa1499ff5b01703ff571c3cd43704135e966e8a0ecfbd0d13569768779aabc63
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 11148 bytes
SHA-256: 6c650303820450c637756f0f768665dbb2c7473f4309cc256bdbbb8cd8ba7b98

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