Malicious PDF — malware analysis report

Static analysis result for SHA-256 481e3e460567d2c5…

MALICIOUS

PDF

114.1 KB Created: 2021-03-26 00:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e2ff0aad7f51f2bdf730baaf245a04c3 SHA-1: 20499d27f8271d509522ebc01125a1fe0913c405 SHA-256: 481e3e460567d2c5dee0b9c1827b142aa1f6237978f58e7322107f9e122f8442
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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://jacksth.ru/strik?utm_term=boy+scout+christmas+trees+evansville+indiana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450350/normal_6047668af2829.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/african_bank_loan_application_form.pdfIn PDF document text
    • http://gasolotiravizid.sportsontheweb.net/iso_9001_quality_management_system_logo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_603895fdb9b3e.pdfIn PDF document text
    • http://tiximixisasosa.iblogger.org/54070686044.pdfIn PDF document text
    • http://xorimomupajo.scienceontheweb.net/mbbs_1st_year_mcq_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452169/normal_5ff0cfc64a5d8.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/arrl_handbook_1990_free_download.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/29736940275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453129/normal_5fc99dc343411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_6019ca6195b03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_93b8a95fa77d4df5b90aebdd1dca1f52.pdf?index=trueIn PDF document text
    • http://nekejikuxomufi.epizy.com/kenmore_front_loader_washer_leaking_from_bottom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b913a4-3888-4ce2-a1c7-4ebecae1a54b/jinopora.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/51511765108.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_c4c808d4a88442b28df4d73a65979004.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_6470567ddef44787b155a37a4b1b844b.pdf?index=trueIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_a8dffd9823dd4f5ba698d941e47c5fc9.pdf?index=trueIn PDF document text
    • http://muluwokixo.onlinewebshop.net/bukokazanujumugexuge.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_81234889b49f4afa84c2776664fb17e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a4b1e1-7a04-4de3-b780-366eed0c9a4c/woxivigigigigaxebo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17293 5272 bytes
SHA-256: 6ee75c8d134767a4932ceaa2023855043a9ce3f91ba9b27553d9f073b945681b
font_01_sfnt_off00018461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18461 12224 bytes
SHA-256: b1563425b65582e91d737b99ac32b2ed36c5090c3f36263fadf3742565411a42
font_02_sfnt_off0001accc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACCC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2