Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dcb4c5747cd745…

MALICIOUS

PDF

73.5 KB Created: 2021-03-12 15:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d77e59e5c114b75d22ac62edd7cd6640 SHA-1: c22ee2b951f5ed642b7fb02378e198e9361a52ea SHA-256: e4dcb4c5747cd745e2c9e1ea821b8a3520233f1e7cc8ed2aaa2d28673cbf3859
126 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's structure is designed to host many links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xezojetit.ru/strik?utm_term=how+do+you+describe+stress PDF link annotation
    • https://cdn.sqhk.co/pobijejok/iHuzsCI/stickman_five_nights_survival_2_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449192/normal_5fdd3f0de4670.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/Nif1Vgc/jusokerematoxalufived.pdfIn PDF document text
    • http://changely.club/surudedokosirademutamhxkte.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_5fd12e19b7d30.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/f8Sjgif/85069737631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_602eac17ef945.pdfIn PDF document text
    • http://kovajofi.iblogger.org/dararixef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404112/normal_5feed240cc854.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/WlUgeN4/ultimate_general_civil_war_confederate_campaign_chancellorsville.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5fce0feca64f2.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/jgzbjf3/stalker_dead_air_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489583/normal_602e5e03e8999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6014aff860bfe.pdfIn PDF document text
    • http://beremoter.online/nanigawunidomelupigokendhaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memujagitukeza.epizy.com/72247589464.pdfIn PDF document text
    • http://zejimuporuje.epizy.com/48145687482.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/where_do_i_find_the_wps_button_on_my_router.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/populerisipave.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_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 4984 bytes
SHA-256: 4379dd8b2bb17f963d2e6a5b14cb692dd812177d0a45cbe7e2251ebc0f1003fb
font_01_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 10256 bytes
SHA-256: c6d1d85abaec72a59e201eb3bbe7cc6bd0caf73aeb09fbdc250869a23307804e

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