Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53a047c1de8d12a…

MALICIOUS

PDF

78.3 KB Created: 2021-03-20 14:24:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3e01f5b6c829751f1f4af5bd0433e431 SHA-1: d0772abc8ceda5edb7c7aa89965f5fb2d4ce8ab8 SHA-256: f53a047c1de8d12a2c74278dfa5399e7ebbec4b4b70eba3387d4ee1657013fa0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=just+mercy+book+review+nyt PDF link annotation
    • http://sixawuragime.iblogger.org/11498948011.pdfIn PDF document text
    • https://vurejubi.weebly.com/uploads/1/3/1/4/131454114/3865807.pdfIn PDF document text
    • http://luminar2-download.xyz/can_scoliosis_cause_hip_dislocationvb2v6.pdfIn PDF document text
    • http://botumizesakukij.iblogger.org/49729716579.pdfIn PDF document text
    • http://wuxemit.iblogger.org/47259739959.pdfIn PDF document text
    • http://copyrightnotices-form.com/97454189089q0yna.pdfIn PDF document text
    • https://fefumuvujudadi.weebly.com/uploads/1/3/1/6/131606087/be26271f5e6.pdfIn PDF document text
    • http://maxetuwugek.iblogger.org/namupulabadekulotibuti.pdfIn PDF document text
    • https://pomorewosijimop.weebly.com/uploads/1/3/2/6/132681296/4128221.pdfIn PDF document text
    • https://negorevir.weebly.com/uploads/1/3/4/4/134471844/suvuwili-rejobezugiwasov-kosut-gumejidokobop.pdfIn PDF document text
    • http://tumbochka.space/sales_management_simplified_mike_weinbergjtwhv.pdfIn PDF document text
    • http://cmbclientes.com/kaxajuzuvubokb2wel.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
    • http://wuginafana.epizy.com/acidifiers_in_poultry.pdfIn PDF document text
    • http://zeluwerilosa.epizy.com/67018703511.pdfIn PDF document text
    • http://bukusisege.rf.gd/clicker_universal_garage_door_opener_keypad_programming.pdfIn PDF document text
    • http://jekiwoko.rf.gd/68747803327.pdfIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_fea47133d95e4871bd898b9431149dbb.pdf?index=trueIn PDF document text
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_f0e63367f1ac42039b75baa9917a9115.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_0f41b262b5634d8fb35ca0aa8e685e5e.pdf?index=trueIn PDF document text
    • http://lojupodinitaxug.epizy.com/vanirotenelosorofiwugun.pdfIn PDF document text
    • http://faxiwig.epizy.com/informacion_plusvalia_municipal_ayuntamiento_de_madrid.pdfIn 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_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 5032 bytes
SHA-256: c0deb1ea36d8580a01d0f17fac9154a166cc9da79c945baccba87a0160c1603f
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 10644 bytes
SHA-256: 27dbd073b8d7f295f9c1649183738621c340337ddf4112d77a1012374c2b0a89
font_02_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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