Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb756280d3b02f5e…

MALICIOUS

PDF

76.5 KB Created: 2021-03-22 21:15:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3a5b7ee866d02fef848f541d112e14ba SHA-1: 8f539d3caf79fde2d6adc97ed13812beb684177f SHA-256: cb756280d3b02f5e4cf8da2de0f7a5a286cc805acd6a45f2f41d58c1ac8b7988
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/123?utm_term=can%2527+t++app+store+iphone PDF link annotation
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/8796628.pdfIn PDF document text
    • https://mubewawabover.weebly.com/uploads/1/3/4/4/134465459/zemat.pdfIn PDF document text
    • http://tewazezila.66ghz.com/havoc_brother_whatsapp_status_video.pdfIn PDF document text
    • http://tcerkovniekupola.space/42581399685z6oxd.pdfIn PDF document text
    • http://1xbet-registrat.site/4369476527890v92.pdfIn PDF document text
    • http://zuvufikeluzodi.iblogger.org/gukifexipubovoxofapon.pdfIn PDF document text
    • http://zoom-omsk.ru/unitekno_703_manualnezhb.pdfIn PDF document text
    • http://mijakaku.iblogger.org/xexaxolaku.pdfIn PDF document text
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/8267540.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/wipiguvixezufawijepof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatajuvezutulo.rf.gd/how_to_read_tarot_cards_simple.pdfIn PDF document text
    • http://kusotuwomaru.epizy.com/papazosarusabun.pdfIn PDF document text
    • http://kigitom.epizy.com/14925698562.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_40b5665264d84698ad19eb88354ce036.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_a62dd609137b4073ba1dd6e4321fc0bf.pdf?index=trueIn PDF document text
    • http://xojazexodiwosi.epizy.com/150872095.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/63763382227.pdfIn PDF document text
    • http://munoxefarofow.rf.gd/what_oil_should_i_use_in_my_honda_pressure_washer.pdfIn PDF document text
    • http://vudemiziwifimo.epizy.com/acid_rain_project_report.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_47b64cc1baae49caa2fbb82aaff182b5.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_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 4812 bytes
SHA-256: 58a3b96fb8f8f407b0a773cd00ce39815ebce35e5ff7d636578d01df293b5635
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 10628 bytes
SHA-256: f93d72452fb6610ecb5bc4232542ba53209a1ce047171d4bdaf61e6258abc3bd

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