Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2504b3ede75f2ad…

MALICIOUS

PDF

74.7 KB Created: 2021-02-20 07:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a93b00c5da008db6c5e7ae57c5181d41 SHA-1: dd68da3292711c37ef0d08c66f76eac1ae8f4241 SHA-256: a2504b3ede75f2ad8b799899acc5644cfd09b97cee76f217b18c2c04c37d63bc
244 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/wix?keyword=marcum+lx9+user+manual In PDF document text
    • http://gometug.22web.org/sir_gawain_and_the_green_knight_summary_part_1_and_2.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/vamamukuloru-pawulobasun-fekavu-gulariromivis.pdfIn PDF document text
    • https://cdn.sqhk.co/taxosavasesa/bjegcgj/om_nom_run_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462736/normal_602d809028301.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/eYhdN3Q/77959567080.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/jiHI8o0/tiled_map_editor_godot.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/ibHjbib/20392165098.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/5348443.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/dAThagc/lebijiravosenixemogikagan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badiwofotafazol.epizy.com/tamasha_full_movie_movierulz.pdfIn PDF document text
    • http://tisudaxutuz.epizy.com/biotabs_starter_kit_manual.pdfIn PDF document text
    • http://wamigorudazuz.epizy.com/weather_report_boston_this_week.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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 5176 bytes
SHA-256: ac75fcfd4edb765b6d9e673c8421d8639ce4d858642f3826ad1bbea55164fc2b
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 10660 bytes
SHA-256: a4796d46f61e42c85baee3209f78099c7bd74a051325c38d80eac108d4c7cf33

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