Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b04b296df06c22…

MALICIOUS

PDF

76.0 KB Created: 2021-01-05 21:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 62e4037c78d42636342ca6721db15151 SHA-1: 970799918d5c88ce353489f366cd37208a86e5b0 SHA-256: 05b04b296df06c229cfcba554ae12093aaabbe72cf97d711c94b02c1a518f921
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. Although no scripts were extracted, the PDF structure and embedded URIs indicate a phishing or malicious redirection attempt.

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://trafffe.ru/aws?utm_term=guided+reading+level+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458840/normal_5faf0fd53f5a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f88b1622fad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f8a7a7a5efb0.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/0250d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5ff0206670450.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/hjjahhk/569349614.pdfIn PDF document text
    • https://cdn.sqhk.co/guviterolovu/bhhV7ge/hang_glider_guy_not_strapped_in_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_5fac3b37b92de.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/2wMJkAG/gotujixufosajugibetopaj.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/hj1hZgc/tactics_battle_of_trafalgar.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/2icgehe/gobifanov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_5fc51231afeb5.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/befafuni/torusi.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/bypass_icloud_activation_lock_iphone_6.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_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 4908 bytes
SHA-256: 07a17d847041d7eb052053745010255ea022606c954e96f50ecc684757309a4b
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 10560 bytes
SHA-256: 33d26625293b1e12a57b00289120999a16140fd5507cf0ef71e0c7ced54ccdf4

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