Malicious PDF — malware analysis report

Static analysis result for SHA-256 809d0589737ad72f…

MALICIOUS

PDF

87.1 KB Created: 2021-06-06 03:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b9d4e7c48faa3c64f0692206a784bdcd SHA-1: 5682e60624f559d1b9426b55ea1b7c87dee57c08 SHA-256: 809d0589737ad72f44eb8b0225a861fce8997384ef18a658e415270ae759d5f2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection scheme, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ketchas.ru/pbw?utm_term=what+is+third+kalima PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386092/normal_601ee5a59cab6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448129/normal_5ff9ead3520e7.pdfIn PDF document text
    • https://matamelo.weebly.com/uploads/1/3/1/3/131384575/2636320.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412897/normal_5ff104970a888.pdfIn PDF document text
    • https://kizuzeno.weebly.com/uploads/1/3/5/3/135326612/mowidojavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_5fdba3c09c7e2.pdfIn PDF document text
    • https://sewajevujunu.weebly.com/uploads/1/3/2/8/132814136/jesikidisarafew.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/dadadalomunij.pdfIn PDF document text
    • https://sugogovofel.weebly.com/uploads/1/3/1/0/131069978/8872662.pdfIn PDF document text
    • https://firajapototirop.weebly.com/uploads/1/3/1/4/131452771/98f9e6e2fbf969f.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/fa950da9-c543-404a-b5fd-497a6450b9f7/what_is_emotional_suffering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b18512-bf26-4da8-bcb6-57824fef3b18/fudetazivimumavipasubuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/223e3083-c25f-4840-b824-af5827334bcb/fupuwulovamura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d891bff-9d9e-418b-a298-af249549fa5a/luwegubesefenexuzutedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9288a3d5-4453-4cca-adcd-9ab0a4f7b0c7/bosch_silence_plus_46_dba_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/819dbaf2-643f-4277-a970-1ac4c12717dd/mymathlab_free_access_code_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8aba86-07cf-440a-b988-8ccfbb397425/2012_toyota_highlander_power_liftgate_struts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc57c894-1d4b-4a4b-9658-e6d09efdbaa0/bumijuralimanum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a039bf-0f7f-4abc-a2a5-3662ddb95b08/the_pursuit_of_happyness_movie_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/587e5461-830b-44d1-a2ba-192d9338fcf9/29751599771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afcbe947-2592-469d-bb7c-2fdfa54e6e63/motiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879c84ce-9419-4c2d-aa0d-0f846d29377f/lidedebe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 5144 bytes
SHA-256: f4d5c65d5ba3db9b6f481378e677d5cf0e4fae935de7568052c26cedc1de2c8b
font_01_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 10944 bytes
SHA-256: 42f283c014ac3eae5f29f44664ed702379fe8596bbfed9cf7b03f3ef43324f92
font_02_sfnt_off0001311d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311D 18568 bytes
SHA-256: 0c8e374756fd35562233a50621001742ddcfb74ddb75714d7fd6d0b060651bed

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