Malicious PDF — malware analysis report

Static analysis result for SHA-256 da83e37b3ac86b31…

MALICIOUS

PDF

77.6 KB Created: 2021-03-28 10:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 27db50d29e5ffd97999a34ba12998f32 SHA-1: d2ea8da7b5e942428635a99cbb84aa8295691e0c SHA-256: da83e37b3ac86b31f1d3edc3c02a25e3fa624d2677dcbd264d0ec910580eb996
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=talons+of+ire+and+ice+not+showing+up PDF link annotation
    • https://cdn.sqhk.co/fusozuwalas/jelYjht/renagijew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_6010c5ef6743a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459322/normal_6051f1afe5edd.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/dusanakilewonu.pdfIn PDF document text
    • https://tiralilibixadu.weebly.com/uploads/1/3/4/5/134500138/6aa92514.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/augejjU/henry_stickmin_collection_infiltrating_the_airship_all_bios.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/diifHif/carnival_shooting_gallery_targets.pdfIn PDF document text
    • https://teguvazotumeli.weebly.com/uploads/1/3/4/0/134041540/a6e1894655b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fcc2cb02ce1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxarivoje.onlinewebshop.net/delavuvabasarelox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867d6200-2845-46a9-83cd-1bf9ad2e8fc8/2007_jeep_grand_cherokee_crd_oil_capacity_type.pdfIn PDF document text
    • http://sarutufasiko.atwebpages.com/50551728909.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/jikopu.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/36225976937.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/cooks_essentials_2qt_digital_stainless_steel_pressure_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f84135b-7e79-42cb-9938-bfaa7386a6a9/a_series_of_unfortunate_events_pc_game_free_download.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_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 5456 bytes
SHA-256: 741b46ff7a4a281c2123869769f02082639dfd168682c49a9f3942b813679f8b
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 10944 bytes
SHA-256: 8852db3de4a0bd9445a3f07f8baf9b99a23337a0875ceb6c784078f4ae309cbf

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