Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7167dbdb7a51699…

MALICIOUS

PDF

123.7 KB Created: 2021-04-06 18:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 146fa6799ee6bf6be70ec5fac2a1c040 SHA-1: 4339215573fb2e1112ba7ae37eaac9ef78546179 SHA-256: b7167dbdb7a516995db391553ecb8574ec62d3dbcf44185c86ca15d1ba6f9b72
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links pointing to disposable domains, a common tactic for SEO manipulation or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/wix?keyword=shelton+smith+house+and+slave+quarters+medford+ma PDF link annotation
    • http://rmk4sale.xyz/chocolate_and_tan_dapple_dachshund_for_saleiowfn.pdfIn PDF document text
    • http://ctyr.ru/97092950157ghygu.pdfIn PDF document text
    • http://thesalle.xyz/567072128459o3rp.pdfIn PDF document text
    • http://reduslimitaly-official.website/dazowajoniduzesudoeaa1n.pdfIn PDF document text
    • http://muzidos.iblogger.org/malibowojava.pdfIn PDF document text
    • http://unosital.space/amy_tan_mother_tongue_rhetorical_deviceszvbhh.pdfIn PDF document text
    • http://canonsburglake.com/vuzibolokalafifmquz.pdfIn PDF document text
    • http://podarokinsta365.site/how_to_program_verizon_fios_voice_remoteubu1a.pdfIn PDF document text
    • http://veranezos.iblogger.org/definisi_agama.pdfIn PDF document text
    • http://jujokifenake.22web.org/kali_linux_2019._1.pdfIn PDF document text
    • http://inscarusa.info/xavixumuucstu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_26bdda3ef41d4b7596c9fd23cd44d489.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_80543e86810d4578a7a7c62db9793868.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mijumomub/79242403711.pdfIn PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_bf43786ff0c94032bbf1d43e67b1c338.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozoxub/35108276284.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/latex_bibtex_cite_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/infinitive_of_purpose_exercises_with_answers.pdfIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_60f4075c1ba44c279aed7b49a11247ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/kufaxalipolinepusabevaw.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_7f4481b8c7744e318f1cca1535db2af9.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_f56bb124ace04320a15066c79197e547.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_a0aa799760454b879c712812d322fddc.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_0f531111bca440e89860dd1d545a9daf.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_off0001a577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A577 5436 bytes
SHA-256: d6f8f7141dc4332a46ffd79e9eeba5b0f99ec128f92f32d02087ce5fd15febdf
font_01_sfnt_off0001b7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7CC 12844 bytes
SHA-256: f183c1a5aa9c7d7a2c840eb4675e1fdf97446d101899c985d1fc8a44e03e7328