Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b40efd9e8ae4bd6…

MALICIOUS

PDF

77.9 KB Created: 2021-05-07 06:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 524450ec09479b475dfa01d134b7eba4 SHA-1: 01052fbc99a2da16c49542c94c1aa3d882e8d919 SHA-256: 6b40efd9e8ae4bd666487301489391f2193cc56c5e02052bf9d37989c12f7923
146 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_CLOUD_DOC_LURE' indicates it impersonates cloud services to trick users into clicking links. While no scripts were explicitly extracted, the presence of external URIs and the nature of the lure suggest a phishing or credential harvesting attempt, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://ponafet.ru/strik?utm_term=project+management+in+software+engineering+notes PDF link annotation
    • http://aazzzry.space/disney_plus_login_issues_vpnnaqig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_5fd630e40258e.pdfIn PDF document text
    • http://zafenoro.scienceontheweb.net/wolivemuno.pdfIn PDF document text
    • http://salimom.mygamesonline.org/8497655696.pdfIn PDF document text
    • http://vigirorimikana.medianewsonline.com/geometric_sequence_notes.pdfIn PDF document text
    • http://fipagolanikobax.mygamesonline.org/analog_and_digital_electronics_free_download.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/gonoserogev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_606e71fd3708c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443624/normal_5fe340109470d.pdfIn PDF document text
    • http://dugarudewemudo.sportsontheweb.net/20961689457.pdfIn PDF document text
    • http://lovechat24.club/kivesurarogedibikaxkqe.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/functions_of_management_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/toefl_itp_sample_test.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_f1ff1424dcda49698e1523150c0a6e86.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_9e4f9a65aa064233af7f0bca0515ef4b.pdf?index=trueIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_c681d372406a4b7086489ed23f20ebad.pdf?index=trueIn PDF document text
    • http://bodegifu.atwebpages.com/5298731956.pdfIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_0ec2f50a25674b4a9b8f8abd1d342b01.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_c412247248e24fa6a8385dcc1180d798.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_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 5336 bytes
SHA-256: 6aaa61d2e16acc5e33d6f28a225bd7ec0b99a82358130e8c72a78c21e3eb1b40
font_01_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 10604 bytes
SHA-256: 9dd98ef509a3e24980014e10800ae218c5130238e6b97e62756a6da0ff09b1d6

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