Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df4a17896b4cbca…

MALICIOUS

PDF

70.8 KB Created: 2021-02-16 17:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 00dbc7d09386de03d07973627a478148 SHA-1: d48b05f44cb22674beb7856280ab4ad3e2eb6804 SHA-256: 5df4a17896b4cbca23459db6950226fbd21d6c60934f8dfc6d63a93dc662f70e
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic for a download button lure further support this, indicating the document is designed to trick users into clicking through to potentially malicious 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/wix?keyword=game+killer+no+root+apk+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5fe5301ba0a02.pdfIn PDF document text
    • https://kexawugidatenak.weebly.com/uploads/1/3/4/3/134338825/ratexejoxer_zukobelajo_bozega.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/gfEgcjd/easy_language_translator_apk.pdfIn PDF document text
    • https://dufeduvu.weebly.com/uploads/1/3/4/4/134481569/midered.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_60270a402f89b.pdfIn PDF document text
    • https://cdn.sqhk.co/sururezog/wShfOgg/64421507220.pdfIn PDF document text
    • http://gogumojaxufibid.22web.org/72665692696.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402710/normal_5ff4206aead5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382961/normal_5ff765801333d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_5fe828b9beeb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_6013dc3fcbb45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391305/normal_5fe137b1dae0a.pdfIn PDF document text
    • https://mivuwapirodi.weebly.com/uploads/1/3/2/6/132681474/5697041.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/kovazon.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/liwutavoru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384828/normal_5fef986ddebd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459322/normal_600e843235660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buguwotibiven.rf.gd/anghami_apk_pour_pc.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_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 5156 bytes
SHA-256: 582967023438074979f444715fb391bc4cabef0332802c8cca93a6653afe1f62
font_01_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 10376 bytes
SHA-256: 78c4dbc3d373c7a8ac14845aecd972d779f7ee0e50488f2abfd98df7ee6605e2

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