Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba1b8da1e9e9df3…

MALICIOUS

PDF

77.3 KB Created: 2021-04-02 00:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2b2b8b9237b1812806ac96db0a63f67f SHA-1: b23f602fdd7a80f7f3d8a8de617551d88d1b50e1 SHA-256: 4ba1b8da1e9e9df33b0c6626ca441f89f3feb796b922f151d8a02c7e6a976922
156 Risk Score

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 0.9992

Heuristics 5

  • 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 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.
  • 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://pelibifir.ru/123?utm_term=bleacher+report+football+scores PDF link annotation
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/lujezugotepajekakumu.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/gejgcjf/jafofuzigumose.pdfIn PDF document text
    • http://optarfes.com/descargar_gratis_el_manual_de_yahweht9mcj.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/jiyA6ij/hashtags_to_get_likes.pdfIn PDF document text
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/bulinoxo.pdfIn PDF document text
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/8752860.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/pedixepafuragogumiti.pdfIn PDF document text
    • https://lavivatum.weebly.com/uploads/1/3/1/4/131437335/fizavesenavipoti.pdfIn PDF document text
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/derikegakawofeva.pdfIn PDF document text
    • https://leduxuma.weebly.com/uploads/1/3/2/8/132814900/9329955.pdfIn PDF document text
    • http://wordwild-store.com/85797316079ajgeb.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/j6hbggd/how_to_draw_all_plants_vs_zombies_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/hhjbgjb/local_animal_shelters_near_me_volunteer.pdfIn PDF document text
    • http://usesalle.xyz/kasenazelunujusukr35uj.pdfIn PDF document text
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/ee5ad.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/mufufonokom-ruxav-tarexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_d4e684a59e8e47ab8923aabc212c7d4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubafezin/facebook_3d_photos_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/5878615125.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/biomedical_waste_management_handling_rules_1998.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/cien_aos_de_soledad_audiolibro_por_capitulos.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_34bc493033ca4d08a83bebe0bdf2c5f0.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_4f1ea8c8424a41d4af1334aa9a3235da.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_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 5292 bytes
SHA-256: ecd3275a247135ad179cffd57aa4fbf40c9de73350e3950f1fafa868bf179260
font_01_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 10716 bytes
SHA-256: 271c47caaae323f17736679abc8ff1f16d6251fa6ef2e53de981032c90a266b8

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