Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c56a1182cc84283…

MALICIOUS

PDF

88.0 KB Created: 2021-03-28 16:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5799b6bc15b18e4e6c5e414df33b363e SHA-1: 922c59593639c97ac121b0139fac083cac056aec SHA-256: 8c56a1182cc8428344ee73ae6812b3763c30503203e06128cad8c85c4615116c
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 downloadable PDF files, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect users to malicious content.

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://leonvi.ru/wix?keyword=nature+cleric+or+druid
    • https://cdn.sqhk.co/mepapogivoma/d5y3hYo/download_family_island_farm_game_adventure_mod_apk.pdf
    • https://cdn.sqhk.co/numorolele/fjg5vo9/nexutavepilabofekakefo.pdf
    • https://cdn.sqhk.co/pananumujo/1KgdhhF/prince_of_evil_spirits_crossword_clue.pdf
    • https://cdn.sqhk.co/sogupavetut/hhSjihb/child_custody_agreement_template_uk.pdf
    • http://fherixq.com/classical_guitar_christmas_music2mhxx.pdf
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5fed41de2dd9f.pdf
    • http://myluckybet.xyz/kinotidenugajapibppeht.pdf
    • http://bunnygummy.ru/65011219182jx68c.pdf
    • http://beautytopshop.site/39596887175htgq7.pdf
    • https://cdn-cms.f-static.net/uploads/4478685/normal_60500635713c7.pdf
    • https://static.s123-cdn-static.com/uploads/4449205/normal_60031e54663c2.pdf
    • http://digtalcaliper09.xyz/pexonidv2jr7.pdf
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/f4b4c.pdf
    • http://nuverlites.online/adobe_acrobat_xi_pro_setup_download7tj2q.pdf
    • http://paypallsecurity.com/10880349429stcew.pdf
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/xukudifebodijebagop.pdf
    • http://merovew.xyz/5034294648p3ngi.pdf
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/jajarekogiwizu.pdf
    • https://cdn-cms.f-static.net/uploads/4403565/normal_60274b9fa9f1c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1da1511e-cc3a-4254-a54c-61df4ca0db13/manual_de_carreo_para_nios_descargar_gratis.pdf
    • https://uploads.strikinglycdn.com/files/7bc57d78-68c2-46cd-ae0f-62ba8bf24b1e/what_are_contingency_tables.pdf
    • https://uploads.strikinglycdn.com/files/78afa23f-0fb8-4467-bac1-07ebbea38c63/zilepi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110c2.bin
7bed007498ba037e8e68cc7feb6433b963978619b21807cc0e5041d7129b34c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 4500 bytes
font_01_sfnt_off00012018.bin
413528baa1c90cad1eef92b5b98c89dff3def5b94803443cd7095448c06dd556		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 10592 bytes
font_02_sfnt_off0001445c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1445C 4324 bytes

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