Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ef0412ae20f2b2…

MALICIOUS

PDF

77.3 KB Created: 2021-05-20 15:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10f683c46d09d5261766091cb82f74dd SHA-1: 8a13b4d204ed7b0eaa417c1af3cbcb3cad1fa72b SHA-256: 19ef0412ae20f2b2b3fe9cc99584d8a223dc0a020c99449b25b2331b31ae9474
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic to direct users to malicious content. The embedded content, though heavily obfuscated, appears to be related to search results, likely a lure to encourage clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=how+do+you+connect+the+ring+doorbell
    • https://fapuwokezisojo.weebly.com/uploads/1/3/1/4/131453853/6217145.pdf
    • https://kuxadituva.weebly.com/uploads/1/3/1/3/131380841/sedez.pdf
    • https://vipuwajaziw.weebly.com/uploads/1/3/5/3/135398090/7413944.pdf
    • https://tozupefiga.weebly.com/uploads/1/3/4/2/134265365/aab808e9.pdf
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/texepogo.pdf
    • https://sobapeseg.weebly.com/uploads/1/3/1/0/131070394/5929581.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sisaxu/zaluzexatan.pdf
    • https://uploads.strikinglycdn.com/files/67fd4e8d-24bf-4fb0-9a80-b23ca7cf9e7c/35881049758.pdf
    • https://uploads.strikinglycdn.com/files/2815b064-d9ff-4826-a9de-466c13538c40/modelo_de_minuta_de_constitucion_de_empresa_srl_en_word.pdf
    • https://s3.amazonaws.com/zagapaxa/didovetubed.pdf
    • https://uploads.strikinglycdn.com/files/c57b4f4e-5682-4f42-a1f0-1c3a2112fd15/what_does_a_hireright_background_check_include.pdf
    • https://s3.amazonaws.com/ponivotigegepub/davifawud.pdf
    • https://s3.amazonaws.com/popilo/jezimixatazorutok.pdf
    • https://uploads.strikinglycdn.com/files/7ca7a57d-d6f0-43e9-b946-c6b26cd632a0/safety_disney_true_story.pdf
    • https://s3.amazonaws.com/dudujopixejikug/51402083020.pdf
    • https://uploads.strikinglycdn.com/files/dac5bb84-4127-4709-a966-e023172c7195/572602202.pdf
    • https://s3.amazonaws.com/retisovojor/how_are_newtons_laws_of_motion_used_in_everyday_life.pdf
    • https://s3.amazonaws.com/fosawef/microsoft_access_calculations_in_reports.pdf
    • https://s3.amazonaws.com/wunojipu/64555936327.pdf
    • https://s3.amazonaws.com/ravuxudibure/burnout_paradise_remastered_trophies_guide.pdf
    • https://s3.amazonaws.com/vuliwisuwig/zokupelasegewivepiputex.pdf
    • https://s3.amazonaws.com/rejiner/18799715290.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef44.bin
a8a7501cb69b61cf40cb76b100277e32ebabdef7ac1b2e8666598d8f49bbe2b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 5108 bytes
font_01_sfnt_off000100b3.bin
0d818ec763eefe37b6dd0c8d9bcb4a837dc930eb0b8ee4be879131e96ff78df8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 11504 bytes

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