Malicious PDF — malware analysis report

Static analysis result for SHA-256 b888b613936a31fe…

MALICIOUS

PDF

67.3 KB Created: 2021-03-24 04:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7537bbe4295a3946945120f57676024 SHA-1: 1991d87651996d8527c078f7941d4c3d6cffd2f1 SHA-256: b888b613936a31fecbce956b9e0ca650f242f1655564014cca0ff8b261cb915e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=50+sombras+de+grey+pdf+google+drive
    • http://kosixanadiguf.iblogger.org/92143108081.pdf
    • https://cdn.sqhk.co/burajugi/hfWzAjc/43554132269.pdf
    • http://jesofafisozosa.iblogger.org/nikifexowidoxiwujikamibu.pdf
    • https://cdn.sqhk.co/xafogatok/iGihVXa/jezosezowijizukesejegus.pdf
    • https://cdn.sqhk.co/wofunukasu/haEhgid/static_class_java_android.pdf
    • http://gododerur.66ghz.com/detujodukebum.pdf
    • https://cdn.sqhk.co/sezabaxo/Afhbhjd/download_game_take_off_flight_simulator_mod.pdf
    • https://cdn.sqhk.co/zoxogatuv/jgNn3ic/kewafevodarofabuf.pdf
    • https://cdn.sqhk.co/sowanigog/LwIEghI/gijano.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mapureju.epizy.com/setediratodubi.pdf
    • http://rinonefor.rf.gd/12520092497.pdf
    • https://c482eaa1-e3aa-4fde-9473-53ba98cc9791.filesusr.com/ugd/94322e_c85c323552584141a8baeebab833b7bf.pdf?index=true
    • http://bibobega.epizy.com/abhinetri_2_movie_naa_songs.pdf
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_61635dcf08c74935a469ee2655e4d634.pdf?index=true
    • http://fozufafetad.epizy.com/66180718141.pdf
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_01a6f2c65a924d0db04add0139d3bfd7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9bb8831a-7d1b-4a6c-b30d-3958b246be0f/70464075505.pdf
    • https://uploads.strikinglycdn.com/files/6dfb3dd9-0a5b-46ce-af65-b97d336e286b/46954637973.pdf
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_618bded2a6994dd6b34d30498b135970.pdf?index=true
    • http://xafotibelazes.rf.gd/vapudususo.pdf
    • https://58fabbca-0322-4868-a582-948aa19840f9.filesusr.com/ugd/93748c_b75b2c3834674a2abf0d6dc510a1f158.pdf?index=true
    • 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_off0000c6f1.bin
bf6f45603106e78fcacfcd2047e4f70c02eb1282dcc30d409b6f037ad02f58ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F1 5832 bytes
font_01_sfnt_off0000dabe.bin
00f02007ba98644513fbd43a1ca4d51d3180989ed62cafdaa567ff5e20a16a00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 10848 bytes

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