Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9548138300255c4…

MALICIOUS

PDF

71.9 KB Created: 2021-05-02 13:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 81aba9aed1a0262b732bb2a382c2c6c3 SHA-1: dfcf3a9db0e57d6b4906c8ea8ce7cf169e65c1ac SHA-256: f9548138300255c499351da5f2f31665304650d55e29896b5039141e914eab9d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. ClamAV and ML classifiers flagged this as malicious, specifically Pdf.Phishing.Trojan. The embedded URLs suggest a phishing or SEO spamming campaign, aiming to redirect users to potentially harmful content.

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
  • 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://botokaw.ru/strik?utm_term=world+history+topics+middle+school PDF link annotation
    • http://wiwikiru.iblogger.org/mayo_clinic_antimicrobial_therapy.pdfIn PDF document text
    • https://litisenos.weebly.com/uploads/1/3/1/0/131071047/5407109.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/heigNgf/alita_battle_angel_movie_trailer_download.pdfIn PDF document text
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/fuwonexetax_biran_puboxonufamuxa_pijufajefejukuz.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/djbSjfc/unicorn_kawaii_glitter_galaxy_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/eVEiejb/sanorugunajeguk.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/gCSwbid/juxaxomukujakilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_6847dcab01304789a7534e32a6f2ad61.pdf?index=trueIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_398171996a054ac28a60ec46266b5975.pdf?index=trueIn PDF document text
    • http://sozotipopesez.rf.gd/how_to_see_page_breaks_in_word_2016.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_330d31133b8b460f8adf9ee2c2ca9036.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_9250923bd7494592a0b0339d82dcd4ce.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_978613ff90254ec6a58b143be75272b6.pdf?index=trueIn PDF document text
    • http://potokuxa.epizy.com/diabetic_ketoacidosis_in_adults_guidelines.pdfIn PDF document text
    • http://poradenojipedu.rf.gd/formal_email_format_o_level.pdfIn PDF document text
    • https://69f7c7ec-f776-4f8b-90c4-e8126cd531e3.filesusr.com/ugd/772020_6ad7fd9c250442c7b00b7182168088fb.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_dd6900f9218243c1a8f920bde3f9ce5f.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_6162ab7bb0aa4fc186213d7a4c32a6b9.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_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 5216 bytes
SHA-256: 3b037440a159609025f1588f129918397aa83c44e6f93e133bf33134a9127f7b
font_01_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 11016 bytes
SHA-256: b523d972891c8f5c84b92edb7b52fc2fc2ef5ae84bf36a7395f6aa059ffc18c4