Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4daa559460420d…

MALICIOUS

PDF

65.8 KB Created: 2020-12-23 16:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 21c6eeab169ca75b7b65b8560525eaa0 SHA-1: 1080b874389f00c4bb72a56b0fb496a957bc5bda SHA-256: 0d4daa559460420dfdb120764ac27aa18f401792800d7274fa255fe86a59946b
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 0.9998

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
  • 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://traffine.ru/strik?utm_term=free+wallpaper+for+iphone+5+se PDF link annotation
    • https://cdn.sqhk.co/dekaroku/FjTuHif/38692109948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_5f8e3ce88c42c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_5f9252fad3a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5fa9da3158405.pdfIn PDF document text
    • https://dikanutedageke.weebly.com/uploads/1/3/4/4/134457663/fesimibuvewabi-kopaj-kutarobolukuper.pdfIn PDF document text
    • https://cdn.sqhk.co/nivuduful/x7jjdge/harrison_bergeron_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469630/normal_5fc22ae764a29.pdfIn PDF document text
    • https://gajarasanen.weebly.com/uploads/1/3/4/7/134714971/7bb79a.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/RDAiEC8/free_games_news_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a7cd9a-d449-488c-8e64-fe49e8803fda/jb_lyle_choral_festival_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2aed7f0-bf1a-4a94-8aa4-c3502c331dbd/venagovovobanobaba.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_off0000bc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC14 5160 bytes
SHA-256: 5dd50472abd109cd6ff3208ac57005ffd2018739562ad9196db47a5cb2977df3
font_01_sfnt_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 14536 bytes
SHA-256: 5a75c306c163cfc972a6b45e599d997fe111ef50cd67f5eaf8cb5116cc951b34

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