Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb98763444ca866…

MALICIOUS

PDF

78.4 KB Created: 2021-06-09 03:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0586737a7d7fe10422d68fad3c5055fb SHA-1: 05882eb7ef2274d64bc0e88a499a21b9a037bf7a SHA-256: efb98763444ca866e382d7abdeb428321f52a5afcb2366e613ef360092aa77c8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used to distribute malicious content or phish for information. The embedded content, though heavily obfuscated, likely serves to mask the true malicious intent of redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://inwebjor.ru/pbw?utm_term=present+simple+present+continuous+game PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413242/normal_5ff2153840c8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417403/normal_5fec15c3adfdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_6060af10a4a1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_6063aa81d908c.pdfIn PDF document text
    • https://jolaxedepodoz.weebly.com/uploads/1/3/4/7/134708869/7991098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_605bc66534f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_5fd18aa8222d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_600fa1dd1904a.pdfIn PDF document text
    • https://nanuvofekoredam.weebly.com/uploads/1/3/5/3/135385966/f832705c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_602200e415afd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492278/normal_5fff4c9d3e639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_6064a8426078d.pdfIn PDF document text
    • https://wipibadosu.weebly.com/uploads/1/3/4/4/134438179/bikusu_roviwevor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5ffef3346bd3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528260/normal_5fecbbd70e1b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_6029a1696075e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144439200/libifejaxig.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/core_and_advanced_java_black_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a92a337-9356-4158-80fd-dde34424c656/does_chick_fil_a_have_protein_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8374e85d-196f-45f1-af54-d68d1bb72c33/descargar_pokemon_esmeralda_para_gba_en_espaol.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144666315/usb_vid_138apid_003crev_0086_win_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7badd76-67fc-4ac3-8769-6fc5daa117fe/effortless_mastery_kenny_werner_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7a304d-b78a-40d2-becb-4dd5dd5008ee/what_is_the_song_ave_maria_in_english.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/f/bitlocker_recovery_password_viewer_tool_server_2008_r2.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/w/file/fetch/144422952/connect_outlook_2013_to_yahoo_mail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2b2111-2649-4b9f-9a2b-bf99d62b5da0/bixer.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_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 5256 bytes
SHA-256: 4ec8b8956800f5c8ce21885e0fa0910b6cf300d70ff4c1f426a63da58d3fea6b
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 11296 bytes
SHA-256: 21114ac0eda87618a88a6e721267676ff6935f9c8391bb602aaa5307ed003039