Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e950a37a8f9bcec…

MALICIOUS

PDF

65.6 KB Created: 2020-12-16 15:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b926128852a936680b302deb33c75d1d SHA-1: ec0416560937ddd67516c7e60696ea6c90d2b683 SHA-256: 6e950a37a8f9bcecbed8d8237c933d4e200c1da65f8f0c65efeb95a65a339191
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF with a high probability of being malicious. The presence of a download button lure and the ClamAV detection further support a malicious classification. The document body, though heavily obfuscated, suggests a lure related to a 'boxing game'.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=boxing+game++3gp In PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/6f62a85d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fca78579068e.pdfIn PDF document text
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/digitapuxexifuvugi.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/rozalaxatob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5fc1db972f1bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_5fc2afedda5be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_5f9d85c3e7c42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa979dbc-3803-4407-8432-802259f7e030/25637344752.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc338c4be9b69395119d659/t/5fc785299dfc2a40452278fb/1606911273320/83338734938.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/red_cat_bus_route.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b06c6879d031da139965/t/5fd1f6dad97b572b89de482b/1607595739467/video_popup_player_pro_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58a1012facd59cecc81e0/t/5fc6d6f93d56556d142b32b2/1606866683726/delafovawexagosix.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e110403f5353fd95a22f/t/5fc105789b1ed03538ffd427/1606485369030/11578322140.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_off0000c0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C4 5116 bytes
SHA-256: b78296bf7c0064d8835913f0fb3aea187a6573151313a133a40472773ddcb9fd
font_01_sfnt_off0000d232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD232 12052 bytes
SHA-256: 45b42ca943fe00a2d89e9acac7c7576058665c30c95c1ee6e1ae4475f2493ada

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