Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b76e760b232705…

MALICIOUS

PDF

86.8 KB Created: 2021-04-30 18:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5848b7644560db48849ba641c6d8f19b SHA-1: 5368b77d4bc10cba4eca05f5f2b4186943e67d60 SHA-256: 86b76e760b23270582ce27bc9664c65a9436ff8d9dbe5c71f1930fda787b740f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=how+can+i+use+my+dvd+player+without+a+remote PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387040/normal_5feb2595b6cf0.pdfIn PDF document text
    • https://cdn.sqhk.co/tonufipu/iiiL18b/62638107068.pdfIn PDF document text
    • http://pixizosusonaxij.sportsontheweb.net/5654345305.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/jhIWvda/clicker_heroes_hack_download_ios.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/muslim_boy_names_list_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/OQuNjb2/head_soccer_laliga_2019_hile.pdfIn PDF document text
    • https://fodivavix.weebly.com/uploads/1/3/1/4/131483454/6113124.pdfIn PDF document text
    • https://cdn.sqhk.co/pajiteka/jaHbEVh/lerofapevunofo.pdfIn PDF document text
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/vuzimitu-wokifotojetetu-davevovijizanuz-mebitazowarab.pdfIn PDF document text
    • https://vebupefipi.weebly.com/uploads/1/3/4/4/134497137/8337970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_601cb13e51912.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/wigosizewidavepeji.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/ansys_workbench_15_tutorial_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_88815044c1df4877af11ef78279af2b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/reprisal_hulu_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/95520786777.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_96773fd85caa4ad3a443f7d08e559b50.pdf?index=trueIn PDF document text
    • http://penanaras.myartsonline.com/alcoro_portugues_download.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_790a9f713d9840c1bb2a2c2771d655db.pdf?index=trueIn PDF document text
    • https://e29f0852-aa8c-4fc4-a5db-fcd144ab7086.filesusr.com/ugd/b730be_49cf089f351e45eb8829596a0ad3d9ac.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_6117cd19c82645469580753deafb76fe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 5528 bytes
SHA-256: 77aab0de8093a5684a2f64494c669ce1b00fdca9ea5c2b668f4b5d7e5a6fdd1d
font_01_sfnt_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 4300 bytes
SHA-256: 50166e65eaab833bb510da83e92538575312cc286ffffc9b843597cb263072e5
font_02_sfnt_off000110ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 10988 bytes
SHA-256: d262de89b929250762c33fce702646ba5a5d6f8a3b745acd158dfde46d869c11
font_03_sfnt_off000136c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C6 16460 bytes
SHA-256: d153ce69763cd4da45e913c5c1007c8fed019d4eabffcffba47c894b5a679ffb