Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4c8afedd8cb51a…

MALICIOUS

PDF

64.0 KB Created: 2020-12-11 20:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7979a200ded883cb2d66ed76626ab723 SHA-1: d60a0603aae0443351ce247805fcbf0ab0bfc6fb SHA-256: 9f4c8afedd8cb51a4e1162ca652bceefdbf427a673631e76adc249c9eb5b61b5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafftec.ru/strik?utm_term=stay+puft+costume+plus+size PDF link annotation
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/kibobe.pdfIn PDF document text
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/nebapuk.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/076d41096d7a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_5fb297825619d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5fc43f90e8003.pdfIn PDF document text
    • https://purolejomi.weebly.com/uploads/1/3/0/7/130776639/9881902.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
    • https://s3.amazonaws.com/vebisop/70020428723.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/office_online_excel_templates.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2aa47ab79f442f234e961/t/5fc94eb962cdae3224e6f343/1607028411283/jamaica_radio_app_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/fakiragujopuxewo.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/dexadodoni.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_off0000b0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D5 5096 bytes
SHA-256: dbdc588ccbaec4f85116a7e823fdad714c4b093347be9a621607d7b869ba75f2
font_01_sfnt_off0000c243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC243 10344 bytes
SHA-256: 14e64ca045873c630acf95dd665f47707305bd7c82330ffd1f0dda7c81c29a50
font_02_sfnt_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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