Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bb5a124ab6a54e…

MALICIOUS

PDF

85.3 KB Created: 2021-03-20 14:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8ac50d79ab30d586d315ca256714006c SHA-1: ed9a55399ee9066e5fe1793ae5afdf4ae6fa0f66 SHA-256: 48bb5a124ab6a54ee0b64b9f5dd2d4f56e88df739fa68529ff096bbac99b1123
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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.
  • 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://golowaki.ru/strik?utm_term=what+is+an+example+of+a+positive+punishment PDF link annotation
    • http://luxomozuk.mypressonline.com/mechanical_engineers_handbook_free_download.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/how_long_to_study_for_gre_exam.pdfIn PDF document text
    • https://repadugudemi.weebly.com/uploads/1/3/0/9/130969496/rewesaloxiwis-sakukinomavut-zewuxowukodawiz.pdfIn PDF document text
    • https://tedatigajixa.weebly.com/uploads/1/3/0/7/130739480/51e5d6523528eab.pdfIn PDF document text
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/973060.pdfIn PDF document text
    • https://kasozufadoji.weebly.com/uploads/1/3/4/5/134523760/5c0d3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419629/normal_5ff92a291fcdb.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/budedonexigub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_60369119b9e95.pdfIn PDF document text
    • https://zalekekowijix.weebly.com/uploads/1/3/5/3/135346798/pevunavikemedipit.pdfIn PDF document text
    • https://vupavekana.weebly.com/uploads/1/3/4/4/134493500/xusesiwozanel.pdfIn PDF document text
    • https://pemowazazafal.weebly.com/uploads/1/3/5/3/135385959/8451261.pdfIn PDF document text
    • https://boletesolekab.weebly.com/uploads/1/3/4/2/134236379/7faa6aed.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/wasuxu.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/60488385185.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nukivamo.myartsonline.com/dilamibiwefin.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/amazon_kindle_for_mac_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f95a3bd-fe1b-4f74-bc19-fa5c185659b1/wakixibife.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/sosokowigobabo.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/nabegalezod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46b0303-6181-475c-8692-d524df88be41/kitchenaid_ksm150pser_artisan_5-quart_stand_mixer_empire_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c70d04c-b08a-428c-a879-e24846a39c44/a_dolls_house_by_henrik_ibsen_movie.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_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 5184 bytes
SHA-256: dc9aacaeff6bce94bdfc88566d32dff9fe07c7b47adb863d0d99cb2688b9bc24
font_01_sfnt_off0001230f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 10716 bytes
SHA-256: 2714852ebe208b173bba01cdf9c97a722956f5a894ef079faf6367e05540b695

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