Malicious PDF — malware analysis report

Static analysis result for SHA-256 243a1c2e3c7d4f3f…

MALICIOUS

PDF

77.8 KB Created: 2021-03-21 02:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: db071c8ffce4f0ff2fb02b98f85926bf SHA-1: a915a51f8a49126e7f5210c98b891b1d27c627d2 SHA-256: 243a1c2e3c7d4f3fc7e07f222316572f22e799197c05fc22774b52896e96c914
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, and is described as a link farm. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful websites.

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/strik?utm_term=ti+83+plus+c+silver+edition PDF link annotation
    • https://cdn.sqhk.co/komagiju/gfrhjgj/74895388934.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/ihpieA4/rabelikinifegaxotemedu.pdfIn PDF document text
    • http://zoosalon.org/how_to_replace_black_and_decker_dustbuster_batteryx9f1k.pdfIn PDF document text
    • http://cleanup-sale.site/12507304114joapz.pdfIn PDF document text
    • http://ueuniti.xyz/flag_banner_template3bgbx.pdfIn PDF document text
    • http://vitrinachel.ru/17049360068ux61v.pdfIn PDF document text
    • http://jushq.pro/vadesinoromusewebwo2ir.pdfIn PDF document text
    • http://phulop.store/sketchup_pro_2015_crack_free_download_32_bitqz5n0.pdfIn PDF document text
    • http://zhk-rekord.info/reasoning_from_general_principles_to_specific_instances9d00a.pdfIn PDF document text
    • http://sosed.market/informal_letter_address_sampledbhab.pdfIn PDF document text
    • http://uablog.website/tufabovotumomowaogb3l.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/12ea5e59-111e-41d7-acb5-f01bd3b26263/how_to_multiply_and_divide_time_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0950e855-d86b-4a2d-9846-8a62a2419b22/75705182006.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_1167b3b84ba8484e9b82e905f22235f1.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_4937b7dcc79e4b69bf16904acb0288a0.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_ebff5c2ed63d4ec5a03e540f2c1ca6d9.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 5224 bytes
SHA-256: fc54c0f1a3c63d041e4ce68e3690b8af8b256079f2f47d20bb9e5e981cf686cc
font_01_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 11460 bytes
SHA-256: feeb53dd0b78cb4e4d0c5fcf06ec349664adbf91feca0bdd646ab4bc91c973ed

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