Malicious PDF — malware analysis report

Static analysis result for SHA-256 3765cd9ad58ef262…

MALICIOUS

PDF

81.1 KB Created: 2020-12-27 14:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 793c4c16010ca2e208b7466d20f58202 SHA-1: d7116433760b31f48fbafc4e5ca8cbf38ddb4fce SHA-256: 3765cd9ad58ef262a28e77174d7a300a2d8545f8f9dbdf29d16fda12aed4662e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicative of a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

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://trafficel.ru/strik?utm_term=simple+tip+calculator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423757/normal_5f9caced31a8a.pdfIn PDF document text
    • https://cdn.sqhk.co/domuzusud/pPih1sN/create_empty_list_in_javascript.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/iM55Mif/android_messages_download_failed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382618/normal_5fc66e1cafe62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_5fa820d37f4d4.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/5336443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368240/normal_5fc988fde0a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f871223165a2.pdfIn PDF document text
    • https://nutikatike.weebly.com/uploads/1/3/4/6/134601603/cacbbc731e.pdfIn PDF document text
    • https://xexogabowagub.weebly.com/uploads/1/3/4/4/134438270/laniwoxuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403681/normal_5fc3e22b8110d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5fdcfedd73d77.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/bulujono/south_indian_movie_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/wegebesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76b646c-1918-44fa-af48-b89c75dc8411/hacks_for_last_day_on_earth_ios.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 5004 bytes
SHA-256: 3d705605eb897caaba757f83ea66c0fa875b8597a8d23c57ffb87da22d988df1
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 10760 bytes
SHA-256: a8217301295be8310fb712d0737b9429faaa6da995298bcae5bd4a4962dd8d1a
font_02_sfnt_off000122df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DF 16100 bytes
SHA-256: f12bcc42cb143e9cc41a08ef9f9c81c8a36c017982c073a20263204097028d61

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