Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40790390ce06d48…

MALICIOUS

PDF

69.7 KB Created: 2021-04-07 18:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6c15f3fd0a0b3ae6a49ab964266c323f SHA-1: 8112993730b08afd846cf9c3d25cef9ade4a3e19 SHA-256: a40790390ce06d48ffeba1a16945789d22613837ef9f9a58f9424b98f5fa0ddb
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 0.9997

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://fokemale.ru/strik?utm_term=%25C3%25A1lgebra+lineal+pdf+unam PDF link annotation
    • http://nazorizuz.medianewsonline.com/neverending_story_limahl_song_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_602c61ed8e3dd.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/jgp5jer/situpajimizinumijumu.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/sojupolozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_606c2a13e98d2.pdfIn PDF document text
    • https://juguzitusiketi.weebly.com/uploads/1/3/4/3/134372303/bulutuwizike.pdfIn PDF document text
    • https://mumixiginuwogi.weebly.com/uploads/1/3/4/7/134752923/jetugomunul.pdfIn PDF document text
    • https://dubuweni.weebly.com/uploads/1/3/1/6/131637072/9de8d5.pdfIn PDF document text
    • http://butalinonoruma.scienceontheweb.net/asterix_em_portugues.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/jdge8DV/notes_for_my_son_true_story.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/b._a._paris_za_zamknitymi_drzwiami_chomikuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443812/normal_602dd90fe1f94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_54116ca7c7914b2e8a493fb269a7eea7.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_5c6bec078ab9402cbf01c9c498985588.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_8b4e95e27209491c9252101dfbcc14ee.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_3d0c63be42d7442eb43fd627b06e2ff1.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_6c9d291a167a493fa01b203d6b78f244.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_ccd9e6f3f81941c3b03b8c36235a0828.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_211fcd220c3f44b8a2d15ae15d62c177.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_e9c296872cec49f3b6dae5ac6d08da21.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_off0000d188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD188 5332 bytes
SHA-256: 4509791a5477dfddebdce2faa9f9b098c90929c4f3e5764bd0fc36a8a9e7ec42
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 11268 bytes
SHA-256: b9198ac130b7b5e71c05a895421ee72a2c9805aacd036c0cae9a7f1907f2fded

Open this report in the interactive analyzer, or submit your own file for analysis.