Malicious PDF — malware analysis report

Static analysis result for SHA-256 384f870368aadb84…

MALICIOUS

PDF

71.6 KB Created: 2021-02-21 14:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 87e54df2a2eeb4331519467fff83d238 SHA-1: 34f36035d16e54b5eda7f78e6127590634bc52ea SHA-256: 384f870368aadb84503a00db62d8028d63fd1bb26318794ba6abea2f464ff1b5
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, but the presence of multiple links suggests a link farm or redirection strategy to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=commercial+cool+freezer In PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/7f2c5a09.pdfIn PDF document text
    • http://clobuss.ru/17352258090un9sf.pdfIn PDF document text
    • http://romeita.space/25266862302n5gq2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382412/normal_5fcd95f09da8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_602e1cb1a3a02.pdfIn PDF document text
    • http://leomannapov.com/actually_synonyms_formalsnm11.pdfIn PDF document text
    • http://picsonair.com/the_thin_book_of_appreciative_inquiry_3rd_editionwbbmg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_60270e7ba8a68.pdfIn PDF document text
    • https://lipixifafamuxa.weebly.com/uploads/1/3/0/9/130969384/xexipubikepe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452624/normal_5fcbca4e22d6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/terajodakep.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/75711476811.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/dinosaurios_para_colorear_gratis.pdfIn PDF document text
    • http://todojenosefotaz.epizy.com/microsoft_azure_information_protection_labels.pdfIn PDF document text
    • http://fenolelogokaxip.rf.gd/mediahuman_s_audio_converter_application.pdfIn PDF document text
    • http://gosiribe.epizy.com/earl_nightingale_30_day_challenge.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 4804 bytes
SHA-256: 3216ce244c0333f2725192ae0e792f162a11d7dbfb86eb96a655f074c2c4fddb
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 10408 bytes
SHA-256: bb61feea62b44a232836a3a9479aa08c56a28d054463779f9ef3988bd129fd3c

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