Malicious PDF — malware analysis report

Static analysis result for SHA-256 d520aa89a9eb651c…

MALICIOUS

PDF

79.3 KB Created: 2021-02-18 21:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: cdfdbdd1647c9affc19fa2be0f2c797a SHA-1: 654810718ae0cbc16ed84bc74ddfd5351c6cefdb SHA-256: d520aa89a9eb651c5e42aeae3b9596d8a5e348232ec17dafd9806316c3e893ac
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and a link farm heuristic suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the attack pattern of luring users with a deceptive call-to-action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/strik?utm_term=lyle+mcdonald+rapid+fat+loss+meal+plan PDF link annotation
    • http://drive4mclaneeffingham.com/craftsman_style_house_exteriorbc71f.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/pinamelutijig_laxidazev_sadejutinigowir.pdfIn PDF document text
    • http://steh-sistem.ru/35806763096o4dea.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/e0d8ec113.pdfIn PDF document text
    • http://hallhq.xyz/formal_languages_and_automata_theory_definition2d70j.pdfIn PDF document text
    • http://vas-rem.ru/how_to_remove_password_protection_from_mac1v5y8.pdfIn PDF document text
    • https://bugotenopiziwa.weebly.com/uploads/1/3/0/9/130969298/49682791c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xitunixanamo.epizy.com/mezoles.pdfIn PDF document text
    • http://raduniti.epizy.com/concatenate_strings_in_google_spreadsheet.pdfIn PDF document text
    • http://dekuxibasor.rf.gd/whole_armor_of_god_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/boundary_layer_meteorology_latex_template.pdfIn PDF document text
    • http://pomuvoxibi.epizy.com/clover_efi_bootloader_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/dedujozalabukojuvetevukow.pdfIn PDF document text
    • http://defixudopa.rf.gd/weekly_work_progress_report_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/tasesu.pdfIn PDF document text
    • http://jatujij.rf.gd/lipusijutoponalotomi.pdfIn PDF document text
    • http://xebinuv.rf.gd/call_recording_karna.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_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 5344 bytes
SHA-256: 4a799a6019e3a822b2b2ef3336d9d8041bec182cad16b918d6e162f79ffcc106
font_01_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 11228 bytes
SHA-256: d5e2754fcd3546c9e0ee3c54b9d240880fb726866d7b80cdd9a09a39040cd9be

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