Malicious PDF — malware analysis report

Static analysis result for SHA-256 30fc39657e213bd1…

MALICIOUS

PDF

77.1 KB Created: 2021-03-15 10:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3bf7bed4149b39914fb55fc8b0d2b61c SHA-1: 5f88104370422764532528004c4cabb28d6d5771 SHA-256: 30fc39657e213bd16eabe60129b2f8ea97b1797416488f87be4e46655b11939f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/award?keyword=difference+between+government+company+and+public+limited+company+pdf PDF link annotation
    • https://cdn.sqhk.co/nuzitomizaj/aiehgLa/8813300709.pdfIn PDF document text
    • https://cdn.sqhk.co/lunemitibojo/HjtE9hi/aptoide_install_apk.pdfIn PDF document text
    • http://sberbank.link/kurevuk2mytt.pdfIn PDF document text
    • https://cdn.sqhk.co/fipexuwebo/hccjjhj/friend_finder_networks.pdfIn PDF document text
    • https://cdn.sqhk.co/darojopul/D5KPghl/tibigojovajetinu.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/617223846439r8e0.pdfIn PDF document text
    • http://static-get.top/77167888783gao33.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/ibhaq16/melody_thomas_scott_first_husband.pdfIn PDF document text
    • http://spindlndou.space/bodyguard_movie_mp4_apkjg85j.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/gcTd0Oi/96567909141.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamujigip/xhghhbg/xejopibotib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifavorufodib.rf.gd/dean_koontz_books_in_order_jane_hawk.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_ae6a5562dd8842d389879a1ec2750538.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc7de72-6f5d-48fc-a3e5-15e262f4a10c/difference_between_daphnia_and_moina.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_36f2cab94d444395a23214af110e5251.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6798cdd9-98b3-4c28-9aeb-124ec19d4a84/xitobomulirore.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_4753b16494274cb3afc719e58eb5716e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db26603-b1fd-42e3-8226-1172559db52b/30314157342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99095413-bdb5-4e4e-82fb-1307b8c5740c/fantastic_beast_and_where_to_find_them_streaming_online.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_80f2da6e9a24407b93a449fb9717b76a.pdf?index=trueIn PDF document text
    • http://dudolisimak.epizy.com/56644593726.pdfIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_3a5ccadad65b4aa083f968eb9b7caa96.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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 5688 bytes
SHA-256: d820e07a199d1b3faed8c704c9e4483155807f3a68dbf06e55105405b8669bb4
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 10444 bytes
SHA-256: c6a2676b2ad5be374590790b75a06bd6004d71aa4cfc3055a1ffd015c35cc4da