Malicious PDF — malware analysis report

Static analysis result for SHA-256 4611804580d1b39d…

MALICIOUS

PDF

76.2 KB Created: 2021-06-05 19:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab98f6dfec7525821de37279befabddc SHA-1: 883fe7d720f90c02bef567801f2d8d6fa6049c33 SHA-256: 4611804580d1b39d8d8e8f83e19e45a9875e7e3c16280d0e258faf20499e2f2e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic indicating a link farm designed to direct users to external sites. One prominent URL, 'https://crysiq.ru/pbw?utm_term=second+waltz+shostakovich+piano+sheet+music+pdf+free', is presented as a sheet music download, a common lure for phishing or malware. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crysiq.ru/pbw?utm_term=second+waltz+shostakovich+piano+sheet+music+pdf+free
    • https://cdn-cms.f-static.net/uploads/4474191/normal_600b95e61c0fd.pdf
    • https://cdn-cms.f-static.net/uploads/4501482/normal_606bc0f8329b9.pdf
    • https://cdn-cms.f-static.net/uploads/4492580/normal_604f9028631d4.pdf
    • https://cdn-cms.f-static.net/uploads/4403271/normal_60256bd37cd51.pdf
    • https://static.s123-cdn-static.com/uploads/4413735/normal_5fcf5887d8aab.pdf
    • https://cdn-cms.f-static.net/uploads/4462985/normal_6052832ebfca2.pdf
    • https://static.s123-cdn-static.com/uploads/4403428/normal_60021b5aeca55.pdf
    • https://lufaranari.weebly.com/uploads/1/3/4/6/134689474/tazogeniwefanes-faluz.pdf
    • https://static.s123-cdn-static-d.com/uploads/4372681/normal_60b63b3459cca.pdf
    • https://bajerezera.weebly.com/uploads/1/3/4/0/134016740/2c8f5.pdf
    • https://cdn-cms.f-static.net/uploads/4494165/normal_5fdad4f841100.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wenitat.pbworks.com/w/file/fetch/144552483/5704333471.pdf
    • https://uploads.strikinglycdn.com/files/290c6c1e-b664-4da4-9b5f-18aedf2c4228/summoners_rift_map_download.pdf
    • https://uploads.strikinglycdn.com/files/d1e712bd-1eb8-474a-8038-7825bd507c38/themes_in_the_tempest_act_1_scene_2.pdf
    • https://uploads.strikinglycdn.com/files/10ea5b54-69b6-41a2-bd45-80002f784728/99937775998.pdf
    • https://uploads.strikinglycdn.com/files/faf0e6a0-770f-4bbd-989f-019f3058a87c/fondos_de_pantalla_en_movimiento_para_android_anime.pdf
    • http://gibuwodebu.pbworks.com/f/fox_business_app_for_tv.pdf
    • http://jesababa.pbworks.com/w/file/fetch/144413424/13442655968.pdf
    • https://uploads.strikinglycdn.com/files/e8710696-bd19-4168-9464-2a8c93778098/how_to_reject_someone_without_hurting_him.pdf
    • https://uploads.strikinglycdn.com/files/6d65e3a7-0a01-4ab1-ac0d-49eb0672322b/what_causes_high_blood_pressure_youtube.pdf
    • https://uploads.strikinglycdn.com/files/b93bbe95-9633-4ce3-a1e8-7cee7b73731f/84130127305.pdf
    • https://uploads.strikinglycdn.com/files/9f8bfb35-fee3-454a-8db0-6eed9d2f248d/aprender_a_leer_la_baraja_espaola_ola_gratis.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_off0000e8f8.bin
4ff524b8744b97f84b46006c4b73fb8af3ee5e309f517f9b8fbcec4cad57a235
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 5764 bytes
font_01_sfnt_off0000fc92.bin
6fa608d9b4ccf78430dbfd8eb7758162d789231f205f9210867402c2fe84219e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 11564 bytes