Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a390a86288406e8…

MALICIOUS

PDF

82.6 KB Created: 2021-03-25 00:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 09dc7db50bdcabd7b26e99b012fe7087 SHA-1: 262a9665d824d5181bc9176143d9551ddb1e2804 SHA-256: 0a390a86288406e8a082cd522f1a3e147960752d3e471204200a023258ce8dec
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary function appears to be redirecting users to potentially harmful content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/award?keyword=arbeitsblatt+bruchrechnung+klasse+6+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452837/normal_60594de8ad69d.pdfIn PDF document text
    • https://kifenefaru.weebly.com/uploads/1/3/4/3/134327755/bonexifokedo.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/gubule.pdfIn PDF document text
    • https://bibokesoxi.weebly.com/uploads/1/3/4/8/134850131/roforotabikofozusamo.pdfIn PDF document text
    • http://sevaxewux.22web.org/robigezemaparitavarexafo.pdfIn PDF document text
    • https://fogipomovilop.weebly.com/uploads/1/3/4/0/134018275/2ec01.pdfIn PDF document text
    • http://artdebug.site/la_crosse_atomic_clock_problems2n4f6.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/what_setting_should_i_use_on_my_scotts_fertilizer_spreader.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/guitar_arpeggio_shapes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_602266e9e31ab.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/jetex_tibovosokakasiv_xefutinav_kodalalafizoxaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5ff69332e618a.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/major_themes_of_duchess_of_malfi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366969/normal_6002b053d92c9.pdfIn PDF document text
    • http://zalavsky.ru/breaking_indianapolis_newsvpr2t.pdfIn PDF document text
    • https://lugonejiborin.weebly.com/uploads/1/3/5/3/135336075/4103099.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/sajaxapububu_feredulitoroze.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/mipunuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383800/normal_5ff8018edc5fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zataweluj.epizy.com/walufetujatixisizezukosow.pdfIn PDF document text
    • http://vefugiw.epizy.com/vekobutovafemedamevore.pdfIn PDF document text
    • http://fazegujopazoj.atwebpages.com/48579400613.pdfIn PDF document text
    • http://sexikiti.epizy.com/code_formatting_standards_java.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 5764 bytes
SHA-256: 28596de328ef5c2cf07ffaebc931900196e98d9992111e71251c2f48395cd43a
font_01_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 12100 bytes
SHA-256: 91067c150f1d75addddc566f6917e19d83c35ee13db3f29aad4e00e56847977d
font_02_sfnt_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74