Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fbd8eaa2d2868a…

MALICIOUS

PDF

67.2 KB Created: 2020-12-06 14:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d3f0ee5aa6fc1aa57590fdd140fb5463 SHA-1: d3aa05d0370b8d7fd3b2be39c4598e32f53e500c SHA-256: d4fbd8eaa2d2868acd177f6d9382dd00530ee4ea9c011ca2262a6489e867b4fc
222 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/strik?utm_term=adobe+cs5+master+collection+free+download+full+version In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f9dfcd42b488.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/2909381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe2417e7202640eab110/t/5fc14031a97599144e254c21/1606500401575/rampage_movie_torrent.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f319ab79f442f229e2d8/t/5fc1904a3570fb44d13e177e/1606520907025/wawin.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1f9b771f5d42aa235ff1/1606229915437/viking_spa_manual_2017.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f186bda9c57a97be6d6b/t/5fc24c24a97599144e427058/1606568996300/how_do_dolphins_sleep_in_the_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22013ba8-a30a-42ca-96ee-69c795d42746/pierce_brown_dark_age_review.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/cost_center_accounting_information_system_user_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/riwusawuvanijigedetok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a7c2c2-09a4-4aea-8860-0a0c096804b5/66895004076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c887c1d8-47d7-4950-a559-42a2c503ca80/23665796545.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_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 5572 bytes
SHA-256: 11f19d7e6d3ebc8a3f351ecf8d6ba6ac266b6ec053a105d56af653509d7694b7
font_01_sfnt_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 10832 bytes
SHA-256: 62aedc1732382a1945d2e48b49c858178bae21edf61584e1540798625c3d613e

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