Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f531035738ca847…

MALICIOUS

PDF

79.9 KB Created: 2021-03-29 02:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4107f3e317bd906baf2e6899d0302fb0 SHA-1: 6254430001c216d3157992939cdf46f58a788807 SHA-256: 9f531035738ca8471d5aa1ee197c4a85b59d33f4f21efe7d95fa61241f799e9f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xezojetit.ru/wix?keyword=a+modest+proposal+satire+worksheet PDF link annotation
    • https://cdn.sqhk.co/terasovo/hehfnhg/38758193036.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_6004503693a00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_5fd8076201b4c.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/aUBBjes/98348502883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446275/normal_5fcb047348c88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_60405e3847197.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/ebVhfRI/top_10_largest_sculpture_in_the_world.pdfIn PDF document text
    • http://bugosegu.scienceontheweb.net/fibupol.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/tybsc_it_syllabus_mumbai_university_2020_19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480412/normal_602ca142a12bb.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/34796976269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_602badb59350d.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/HhdjeUP/76749295912.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502439/normal_5fe0d57c9bd4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_6026df02aeaf3.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/f100f4f0-6147-4cf7-b28a-54d2f57fb171/8515345497.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/model_3_long_range_speed_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f66b5f9-12f8-4da9-a99b-84909a32bf4a/tifav.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/gul_ahmed_bridal_bed_sheets_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/stock_inventory_sheet_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b2b82e-abf9-4f74-8a54-8d3d6126aa8d/can_you_import_tracks_into_garageband.pdfIn PDF document text
    • http://www.readwritethink.org/classroom-resources/lesson-plans/seeking-social-justice-through-30In 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_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 5344 bytes
SHA-256: ca69acc525a7acef20444bbea0640283975d2d095f2026d6d9729f154fa1c244
font_01_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 10884 bytes
SHA-256: e68147e34b7d794e06b1305ed0f2e4dd3386d99fe83eb7e51ad863ccd77a2d1e

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