Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc53771e04cdc930…

MALICIOUS

PDF

74.0 KB Created: 2021-03-20 05:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9d4e7775e016d0644231fbe798e62fad SHA-1: 13b653b9da2043b3e0c0153da50410154c0656b4 SHA-256: dc53771e04cdc9300020ee7929c11e8d0b6684f7e1b34f1d720e42ad0a65aaff
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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.
  • 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://zajinet.ru/award?keyword=preparazione+al+celi+3+pdf PDF link annotation
    • http://alisabor.design/matrimonio_sobre_la_roca_descargar_gratis8r0fi.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/5f55c4a379d6953.pdfIn PDF document text
    • http://govnososal.xyz/fpies_international_consensus_guidelines1bkgn.pdfIn PDF document text
    • http://carinsusa.com/sharp_split_system_air_conditioner_manualul7ve.pdfIn PDF document text
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/suxinibeb-gabaka.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/a0ibGmE/pc_3d_movie_maker_software.pdfIn PDF document text
    • https://cdn.sqhk.co/perekowemo/AomibMl/faseludaxopokojadaxasid.pdfIn PDF document text
    • http://natiral.space/what_does_guerrilla_tactics_mean7q118.pdfIn PDF document text
    • http://meetsoda.pro/mixidapolojamuvopatuvuze68vgc.pdfIn PDF document text
    • https://cdn.sqhk.co/xabiximakef/ha5OkcB/jbl_music_1_subwoofer.pdfIn PDF document text
    • https://fopunideneluw.weebly.com/uploads/1/3/5/9/135965314/woxekakir.pdfIn PDF document text
    • https://xijaxerunoseme.weebly.com/uploads/1/3/4/3/134306079/cb26135b81ae525.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/hiajjXP/tigonipabesewolasutofozo.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/jgUPihc/call_of_mini_zombies_2_mod_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/somujatiza/Fiaifjc/210981859.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_0dcc9b2a7b0d4ad8b65309c753bef93b.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_f71edfa557ec4d5a832dead181fc21f6.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_571bebd6eae84f82a13292d20347231e.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_acb67b88f91c4b11a6b59a8a2863be7e.pdf?index=trueIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_701419e766014c93948416ebfee2332d.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_51bd39d6667a4ed294d7b77864d12843.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_286fb5258e7742a2a0221158e72e409c.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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 5184 bytes
SHA-256: f6c1c765d7f7ec466735aa63db00e63688e060a132b2ab27fda42cb6ee5963be
font_01_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 14392 bytes
SHA-256: 6e70e04800e644870f1cfae4623a404554d8b111f3c513982ce515f802aeec58