Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c3eae61f61917c…

MALICIOUS

PDF

82.6 KB Created: 2021-05-20 10:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 52565756ad72a6c01c00932966d61771 SHA-1: 4657533c986b06ada8dc9ffc56475e1ceac78996 SHA-256: 44c3eae61f61917ce5dd9816799e9ae19c7ca5714be2b33d0d1c5c4640a39b87
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to be a lure related to cleaning a chair, directing users to potentially malicious URLs.

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 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.
  • 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/strik?utm_term=how+to+clean+steelcase+chair PDF link annotation
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/madawonemedu.pdfIn PDF document text
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/cbd6d2113b3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_604a9290bf02a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_602488436d21d.pdfIn PDF document text
    • https://mivagori.weebly.com/uploads/1/3/5/3/135318233/1bbbf2e3966a7.pdfIn PDF document text
    • https://xudapugi.weebly.com/uploads/1/3/4/7/134702609/kufejuz_zuwezerabovivat_parumenaxugi_tegata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_5fdac525446da.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/wonakozedurip_jexoselajaka_tegowu.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/xuzijo_xepexonap.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/3034324.pdfIn PDF document text
    • https://vakumijajuxos.weebly.com/uploads/1/3/4/4/134465568/gafejegepise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_6069b53a4ee83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rebomedug/stihl_ms180_spark_plug_type.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/wofopunotukavotude.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/18560224023.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/tawny_port_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/jaipuri_bedsheets_set.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/computers_in_biology_and_medicine_latex_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/papoxepixokitikivin.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/the_adventures_of_huckleberry_finn_theme_and_character_-_chapter_1_quizlet.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_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 4940 bytes
SHA-256: 519049e5ddf7029552b8fcda31cf92e34277a46cd787be759f67e05858f21d7b
font_01_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 11000 bytes
SHA-256: 769aef495e918a0f9c01dda49bdb2b9552e3c1a7935916dbd80af26864352490

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