Malicious PDF — malware analysis report

Static analysis result for SHA-256 591a85531ea0c18d…

MALICIOUS

PDF

74.6 KB Created: 2021-04-13 12:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 97ef87c2f3477a46192799d123fd5b9f SHA-1: 57276b1aad11f48107805f4887edd67b660fcbd8 SHA-256: 591a85531ea0c18da34e459e3e799c7ae167a41030b6cdf7d487d61df9bd1644
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 hosting, suggesting a link farm or phishing operation. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=what+can+cause+chronic+bloodshot+eyes PDF link annotation
    • http://es50off.pro/principles_of_nonverbal_communicationygxde.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/fIrgdib/fasufezudezi.pdfIn PDF document text
    • http://stebsmeh.space/robzone_duoro_xcontrol_hasznalati_utasitasc1y6b.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/egd3ihG/sijifusepajewi.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/51ihggk/creating_sla_reports_in_servicenow.pdfIn PDF document text
    • https://cdn.sqhk.co/telapunojawu/cijQE9s/daritum.pdfIn PDF document text
    • http://hhizmet.com/zururajananapukelifamoeqx6c.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/hghid6p/zopidekiganajikeremexun.pdfIn PDF document text
    • https://cdn.sqhk.co/kotolodegag/vrhifhe/us_gaap_depreciation_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/Tgddgeu/jitiwigufexinebakijuzig.pdfIn PDF document text
    • http://rocketdocs.us/vuximakivotewizilubxv7kd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://texaliborobiko.epizy.com/photoshop_7._0_gratis.pdfIn PDF document text
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_2220de48c17e4c7eb6c71864dc20a709.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_3bf706fb4df94bdfbb31856718ba2853.pdf?index=trueIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_7337a2745819495185a664ced1b2e337.pdf?index=trueIn PDF document text
    • http://naxisimi.epizy.com/why_is_thirty_one_called_thirty_one.pdfIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_fdbd6e56f7004edf9d9049eaba9b5c10.pdf?index=trueIn PDF document text
    • http://wawaxujogoned.rf.gd/depabilezi.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_29045e5aa8d04bbcbcfeec1a74241215.pdf?index=trueIn PDF document text
    • http://kekogixo.epizy.com/binomial_cumulative_distribution_table.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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 5280 bytes
SHA-256: 198f37dcc9528cd8c4a2a7ecb6d87e62a9970bc88adc499784e647e298f1e5b2
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 10288 bytes
SHA-256: 09aa3ca43ad5df648a0422cdbfbaefa2a9bf03dd511a89f16bb4d37f70f4394a

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