Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4b7aa5fb4f21bc…

MALICIOUS

PDF

85.0 KB Created: 2021-06-04 15:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a4d7d2725981ed5e59ca16d704eead77 SHA-1: 469b2a6cbd514125ee01083f9d08d3672d4e0e7d SHA-256: fa4b7aa5fb4f21bc720e1ebaf1e9a84758ecd2e6427dd444d5507a93cc342c6b
186 Risk Score

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 0.9993

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://ketchas.ru/pbw?utm_term=descargar+diccionario+de+t%25C3%25A9rminos+m%25C3%25A9dicos+pdf+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410730/normal_60589aef9e547.pdfIn PDF document text
    • https://wewowalowumuv.weebly.com/uploads/1/3/4/0/134040384/7534f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401714/normal_5fe182fb30714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5ffded6ada40e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387711/normal_5fcb57314819a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_605be679ad2ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460255/normal_5fccd340878be.pdfIn PDF document text
    • https://xifofenanupov.weebly.com/uploads/1/3/4/8/134857182/1696866.pdfIn PDF document text
    • https://tosufiriro.weebly.com/uploads/1/3/4/4/134472590/nusepu.pdfIn PDF document text
    • https://movamapipimopi.weebly.com/uploads/1/3/5/3/135303402/xovazojataxokufitafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377400/normal_5fcd5db0e9e0c.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/d8ca0f406446.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giresizuloki.pbworks.com/w/file/fetch/144581946/libro_de_apresto_kinder_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c16ade0-dda6-4bd4-a518-02a6eb3b8ed1/how_does_the_book_1984_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceaddec9-1c55-45c0-918a-e2445bb1da9c/nebutufadib.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/w/file/fetch/144556068/chemical_bonding_class_11_ncert_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9deb1c-e237-4552-b19f-f2aa45062fce/jasabukezexafozemonubigib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5066b4f1-df47-4082-a0f3-ff13decfbcb7/using_algebra_to_solve_for_angle_measures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1dd8b3f-8997-4eb7-8ef6-3911ac514781/bobukez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03ebe2b-a3ba-4788-a742-4d02896a2f01/aimpoint_pro_with_6x_magnifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb023e2-c6cb-4da1-91b4-ce3d57f453b1/2020_honda_1000-5_side_by_side.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ffe2de-2f8c-4c6f-b150-195a505df7bc/how_old_should_a_guinea_pig_be_to_bathe.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/74793448507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042286a3-b238-47bb-9fdf-f23def5b16ec/vojixipizopunufugetogotu.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_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 5584 bytes
SHA-256: 294aa1972ab8c3e800ba81b0762a6e09beaecbe7ffa697a60668b23458670488
font_01_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 12052 bytes
SHA-256: 9bd7fb09609cbce7ab94fec90a1da44f05c9a3d183b7612cc8147a944f65bc29