Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf82ce52b6025c1…

MALICIOUS

PDF

64.2 KB Created: 2021-02-24 03:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9ffcbdae041d6073ef7cd9b262f03d8b SHA-1: 8bb5259938279ca05d85315620131c6239da4072 SHA-256: 4bf82ce52b6025c16cdcd4b6056173a505257e49ec1f902e27629aa117fe2271
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-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://seumenha.ru/123?utm_term=ascp+boc+study+guide+6th+edition PDF link annotation
    • http://g2am2e.xyz/33662217063mcjum.pdfIn PDF document text
    • http://greyfruit.space/apics_dictionary_13th_editionmqi91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_5fd1025d3fda4.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/7344807.pdfIn PDF document text
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/567c27833a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377380/normal_5fc9440554b45.pdfIn PDF document text
    • http://lifeshop.pro/html_canvas_tutorial9d9hk.pdfIn PDF document text
    • https://xinefozi.weebly.com/uploads/1/3/0/7/130775465/8617607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_6019d8b823fd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471703/normal_600408adf037e.pdfIn PDF document text
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/dc838d7ced.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/warapagefasovi/pivovasomasiw.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/gstaad_restaurants_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/53243453358.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/boruwiwakin.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/machine_breakdown_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/telugu_movies_2018_3gp_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/bijet.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_off0000bf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF36 5380 bytes
SHA-256: f52418c8f82ae33fd2bdaad0ee194f7eb7a21a79c90d770dd71482e83cf8ed80
font_01_sfnt_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 9944 bytes
SHA-256: 0ef1892647a7369dd54c03f58aff0598d51ea818f1fe012dc8164aecf72ff652

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