Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d557f1bd06fc18…

MALICIOUS

PDF

71.2 KB Created: 2021-03-30 05:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7e3bb3fad687142ef6b5ab7f96668fbc SHA-1: 82ab517c7464e34a5305c9f9994a0f9f8abb48a4 SHA-256: 42d557f1bd06fc1890eb8b6f032804bfd3aaf8baaebd755f5ffedd4763eb67f8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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
  • 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://resalured.ru/wix?keyword=cable+hayward+arts+council PDF link annotation
    • https://cdn.sqhk.co/kajutizikodu/fvifmjd/jubixutirakojewigigovo.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/hfDiaje/wamogokitejorisu.pdfIn PDF document text
    • http://jatulusejeb.iblogger.org/39679811786.pdfIn PDF document text
    • http://rozefuzapotor.iblogger.org/bar_graph_in_android_github.pdfIn PDF document text
    • http://pefujogori.iblogger.org/zupigin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_f2ba335c1e804be58a72156c8514b9e6.pdf?index=trueIn PDF document text
    • http://nulabede.epizy.com/better_call_saul_season_4_episodes_guide.pdfIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_eba95a90fdf64abf96deb91bed9bc8c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/moronubikuku.pdfIn PDF document text
    • http://ligumawi.epizy.com/nesopuwifilibebani.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_c71feb53a9544cf594d914f25b053299.pdf?index=trueIn PDF document text
    • http://zoputivep.rf.gd/bigov.pdfIn PDF document text
    • http://zidibivitu.epizy.com/barron_s_gre_50_word_list.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_49c84ba60aa44209b77e40277f90d435.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewiro/scriptures_on_the_good_news.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_3f4c02d78d944f5a8e417089cd442e64.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_d49d3d6c88604b478bce3838c12b5b21.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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 5264 bytes
SHA-256: 5987283a7076610e2a6c31459e37e7c44410dc8971b3647a5ca294456848cd29
font_01_sfnt_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 11316 bytes
SHA-256: b5767dc3c85cd28058768c7b2979177342af110f166b5c240ae623c8598897c0

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