Malicious PDF — malware analysis report

Static analysis result for SHA-256 5590aaf113a24b4b…

MALICIOUS

PDF

77.2 KB Created: 2021-04-05 20:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ef2b74b8427776d08850b60d43d768a3 SHA-1: 2f144d980fcca261bce1fceb605f29a54f3f2d67 SHA-256: 5590aaf113a24b4b6a7edbc6837d3807deda874ea91a45a38d2fb2c258f495bd
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of multiple links to disposable hosting suggests a link farm designed to funnel users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=can+led+light+bulbs+be+used+in+an+oven In PDF document text
    • http://goxivomibivufuv.mywebcommunity.org/morrison_quimica_organica_descargar.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/mixtures_and_alligation_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/hOhbhcv/natewu.pdfIn PDF document text
    • https://cdn.sqhk.co/kigowabalo/ljhjfF5/bokegixajulorosulepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_6026cdbfe6953.pdfIn PDF document text
    • http://juraxoxodas.scienceontheweb.net/ncert_physics_textbook_class_11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_6015eb7790e38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_5fcee8aacbd33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_602e5408cf55f.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/QhdNzib/83469018002.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/51825552306.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/MhddhdJ/wyvern_ark_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/lElhajc/kingdom_hearts_3_yozora_kupo_coin.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/autocad_2d_tutorial_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467325/normal_5feb6f5348cbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://valupakukav.myartsonline.com/19150488798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bfc55d2-942c-407a-b011-9751d626a3ce/fulotizedopomawew.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/formato_de_minuta_de_constitucion_de_empresa_eirl.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/vutexijebe.pdfIn PDF document text
    • http://bavufupuvamopaf.atwebpages.com/marvel_encyclopedia_2020_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/kofosewadojese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11c7837-17fc-4684-aa1e-d27be7f9ae21/lefirifuxukodewizasupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d851fbe3-1fd2-490c-bd48-00981148b705/66426240571.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_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 5096 bytes
SHA-256: 76df0b32629b011bdce517f7541b2b3be95f0f1a95a60c41cfb2c7883fd8f6c0
font_01_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 11144 bytes
SHA-256: 0b5f536ba32385f08613fb69d95889479e67b58d7016ed31a74d0a12cbe0e280