Malicious PDF — malware analysis report

Static analysis result for SHA-256 2455b3a67a1f057f…

MALICIOUS

PDF

74.7 KB Created: 2021-06-06 04:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c7bee89dca56691bdc58ddc5a76c6ade SHA-1: c6c68b6b1b0650a65e94b584b216eef98a545def SHA-256: 2455b3a67a1f057f6972d93d8c9946afd5c609a600cb4728abc0365a01bc0078
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct textual lure is discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://krisoc.ru/pbw?utm_term=zero+and+first+conditional+practice+pdf PDF link annotation
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/a05eb46ca53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388614/normal_60094b0b8aa2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_6064dac825f74.pdfIn PDF document text
    • https://fuvodaxe.weebly.com/uploads/1/3/1/3/131379021/wubarof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386620/normal_5fc6824395d8b.pdfIn PDF document text
    • https://najutumivuzobo.weebly.com/uploads/1/3/4/4/134473994/forimazapanokezetime.pdfIn PDF document text
    • https://wivevesatowot.weebly.com/uploads/1/3/0/8/130813399/ferelisetar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_5fd7f6dab6003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_6064765ae9f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_602b833126736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_6059b0fda9b47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443799/normal_5ff281a81887d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450640/normal_5febf57224e3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_602579f9bb615.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/76f7fe84-0bc7-426a-bfca-e4624ebaed58/kadixidoxebekik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4739e4a4-8a23-4afb-b77e-78c4939fbec4/why_is_my_honda_accord_check_engine_light_on.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144634794/weird_texas_laws_still_in_effect.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/62152078654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d747aeb-737b-47d9-b7ec-771912eeb11b/how_to_lie_with_statistics_darrell_huff_summary.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/f/lovelirerikuto.pdfIn PDF document text
    • http://vedufid.pbworks.com/w/file/fetch/144603537/what_does_inactive_fortnite_account_mean.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144515712/32944414192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19167b82-1847-42b7-96ec-a052b9231339/what_are_the_three_branches_of_government_and_what_does_checks__balances_mean.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_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 5108 bytes
SHA-256: 590e4172316f7434e71af40cd83ac52bde477d501a9d1523eac17cdbf9046336
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 11168 bytes
SHA-256: 6a8e5fb21932e6850a738350ddd72bdc4c9fd7f12865961728346a1e8177b9f7