Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdf5699a41dc71e…

MALICIOUS

PDF

88.4 KB Created: 2021-04-09 05:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3d24343aabab66a47285980f0d709d92 SHA-1: fb0949999122b6acb95f6b67194fa54abd95c373 SHA-256: 5cdf5699a41dc71ec20305cf40eb6a14227a6ea5268e2c496f19f857a2f634d1
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document contains numerous links to external resources, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristics indicate a lure for password-protected archives and remote support tools, implying the document is designed to trick the user into downloading and executing a malicious payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://jacksth.ru/strik?utm_term=how+to+replace+ink+cartridge+on+epson+xp-440 PDF link annotation
    • https://rugoxeribagiwa.weebly.com/uploads/1/3/4/5/134529694/97161b7cea988.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/FXggHig/free_video_downloader_app_for_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/bNDjbhd/splashtop_personal_anywhere_access_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/bIjfb5B/worifezafadomavefimo.pdfIn PDF document text
    • http://mybatut.store/gabasowojezifufirujezufatngqop.pdfIn PDF document text
    • https://nopetozu.weebly.com/uploads/1/3/4/5/134507327/9985157.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/chckYZC/xukejawubesetagemili.pdfIn PDF document text
    • http://all-gopro.com/photography_website_templates_themeforest1t64j.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/qznUDii/change_color_eyes_photoshop_cs6.pdfIn PDF document text
    • https://cdn.sqhk.co/daladovum/iidH4hc/stickman_destruction_4_annihilation_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/480263ff-c91c-413d-b03f-79d2d6f5a24b/zigigarapofotuvip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102774ef-4e62-422b-a917-e486a75b28f8/dog_man_dav_pilkey_summary.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_6cc6b417bbaf4315a09b8c63780751bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9776e77-4c1e-4b53-8b49-c52d7dd91041/how_old_to_work_at_walgreens_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91c0b22-0ef5-4881-bf28-9971e5faf979/soundpeats_trueshift_2_wireless_earbuds_review.pdfIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_23825d4527ba4bdba86a4a5499d5ae7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd0758a8-9b3f-480e-8ce4-e99c50dcbc51/82123888267.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_47eb3850ade144029aa54a47547a2f69.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_c4efeab2cbed4d30a6f9bbe28e934067.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_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 5688 bytes
SHA-256: 323433c316c8b54161f618028dc32e6868f363535f68b5d2bcb6e0930f15c1f4
font_01_sfnt_off00012c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C76 11144 bytes
SHA-256: 60334a584751a84e9d2f9d9aad40c16a904b7ce7b08cce07665becc8abbc4a34