Malicious PDF — malware analysis report

Static analysis result for SHA-256 75999044cd9c830a…

MALICIOUS

PDF

70.8 KB Created: 2021-03-19 17:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2955616c43b94f6bc74998535e315353 SHA-1: eb1eba9dfab8e6d860541a0b041b9ed2c80d071c SHA-256: 75999044cd9c830af83f170cc893178b16cfdfed35b669415c672e5f90286c54
186 Risk Score

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/wix?keyword=%25D7%2594%25D7%2590%25D7%2597+%25D7%2594%25D7%2592%25D7%2593%25D7%2595%25D7%259C+%25D7%259C%25D7%25A6%25D7%25A4%25D7%2599%25D7%2599%25D7%2594+%25D7%2599%25D7%25A9%25D7%2599%25D7%25A8%25D7%2594+%25D7%25A4%25D7%25A8%25D7%25A7%25D7%2599%25D7%259D PDF link annotation
    • https://cdn.sqhk.co/wazafanez/1t5tqEf/80400492133.pdfIn PDF document text
    • http://tamazilewuviden.22web.org/best_zombie_survival_games_xbox_one_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/jiNxKgj/31800857561.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/jaa9CyK/vufifexodiruburebezib.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/hBhjghF/cadena_100_argentina.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/1bheijL/blood_pressure_readings_explained_australia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jadere/wojixoxadodev.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_bfd38dbe3f854d759b7a23096b4af910.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_e49d89c031e341cf925f446594826294.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_1145829e37de49a89dc45c4225d8be58.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_f99bbc1f54894d3b9e5a69226e4409a0.pdf?index=trueIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_6edca978682d4892a4745c78994b7ec8.pdf?index=trueIn PDF document text
    • http://rilinaga.epizy.com/denesoretituremumatukam.pdfIn PDF document text
    • http://sowawobajomo.rf.gd/company_logo_design_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/adarsha_vidyalaya_application_form.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_8934aaa3aff447f0a05c7e6b2b4460ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/69797452778.pdfIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_a6518b7e4e0f4a0ba5bceacdecabfd92.pdf?index=trueIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_f4ec004dd08e4490ae51008acf96af2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/mokafuzonilewajumav.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_0fb79af5d0ae437a967d0f9a7e3115a2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD240 5200 bytes
SHA-256: 491c25f6bd7e6425edf7dfb63dfe680136ca42dcefdce37d8b84ac72e2a470a0
font_01_sfnt_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 11416 bytes
SHA-256: 0bcb815c411be7ccbd568460ca6c8117847b3f551dde1742a7b164a5510cfb0f