Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbfe4e546762fd8…

MALICIOUS

PDF

74.7 KB Created: 2021-03-10 09:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6273b4b72cb00e20d55ec10164cfedad SHA-1: e7084eee07f73c5ccae6d1c64926da42a347a12f SHA-256: 9cbfe4e546762fd88a8be9d168a222cc7b14af97c0870f92aa12ec11cbcd31c2
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to potentially malicious or SEO-spam domains. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure for 'administrative law full notes pdf'. The presence of numerous links suggests an attempt to drive traffic to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/award?keyword=administrative+law+full+notes+pdf In PDF document text
    • http://lalabomujulimof.mywebcommunity.org/resumen_del_libro_el_principito_capitulo_14.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/32782099128.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/28992919306.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/43474397176.pdfIn PDF document text
    • http://cozyplacefor.rest/588702390497fqt7.pdfIn PDF document text
    • http://ita-talia.fun/calculos_de_preparacion_de_soluciones_molares55tag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_2638f19d21f94e8d8beda2a2eeb1db40.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_2f4d2b4d8e0c45938497a14ded66b21a.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_0e7df9af22804939b1fa29094d81ddf7.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_ad2f5f4fde074df7b7ff9423bdd47220.pdf?index=trueIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/uk_driving_theory_test_app_2019.pdfIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_709106e06afa4f16aec85ae72f2e0510.pdf?index=trueIn PDF document text
    • http://vosowetawevu.epizy.com/amulet_titan_guide.pdfIn PDF document text
    • http://zovaner.rf.gd/casio_aw-80-1a2ves_manual.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/how_to_redeem_gamestop_code.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_67a83a98cc0341a09ca0e14b7f7ac100.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_8e18a5fe6f64457f8a84a5917873c616.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 5208 bytes
SHA-256: 9fea245aa92fcba02886cbee30042feffeb5be7a62a66478eeeca8d6712630c7
font_01_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 9824 bytes
SHA-256: 901dba627a6d1a91f51068ce5c6a214cc1e0e8e16daff084e99266e5cf8f86be
font_02_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34