Malicious PDF — malware analysis report

Static analysis result for SHA-256 900b9162811af39a…

MALICIOUS

PDF

84.4 KB Created: 2020-12-15 15:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: db1019ab4b60eb2df5739120c6204859 SHA-1: 24224a6ebbc484fd71b7af14003207e09cab8258 SHA-256: 900b9162811af39a9d71321bd1f1a2444dd9f565a4c98a4e41aa3fbfe0357a0c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded URLs, a common tactic for link farms and phishing campaigns. One of the embedded URLs, 'https://traffmen.ru/123?utm_term=is+a+whale+a+fish+weinstein', is flagged as malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' further indicates a high volume of external links, suggesting a malicious intent to drive traffic to potentially harmful sites. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://traffmen.ru/123?utm_term=is+a+whale+a+fish+weinstein In PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/vibonugadumo.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/5fc0e155104edf1d7780ac3e/t/5fc11f493f75b16643fc24cc/1606491985546/95408327445.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10aaaf9866f3fd2d521c0/t/5fcc17289aa2de0c648192d2/1607210797196/1440107498.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5904aff13940aa25f39a7/t/5fca4e6a55485c3109bf72cd/1607093866653/fear_the_walking_dead_season_4_episode_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f64a18-a618-4017-a97c-60a5e5b5ca85/risk_management_consultants_uk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f2f6c89e1c4b8fbea157/t/5fcf66c8556296156151f2ee/1607427784602/21652427659.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/fix_blurry_pictures_android_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfdf2032-5a20-481a-af1f-4b887928ca01/76896367476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15147317-4561-4ca7-bc5e-3107f123cb94/41863048153.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf5c8eaf37e3b64614c06/1606284745113/dijipubosan.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_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 4788 bytes
SHA-256: 56780ae5fbe9eaf0c70ba1f61eed6d88bde258b1ec741d25b60e26e3ddc074ad
font_01_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 10268 bytes
SHA-256: c44e81af908c4d24bb4144b2a3341fda5b67c26698581f5936640dc27f1a29b4

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