Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a728f3ee93f6a53…

MALICIOUS

PDF

73.2 KB Created: 2020-12-18 05:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5f8addfd806266c46f63beb6f87c7726 SHA-1: 51632b4331c4d8eca3c14feccffbd124baf52391 SHA-256: 8a728f3ee93f6a537f46c5d0f5d3a33616b1bd766b3aa752302341dae07ed672
214 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 embedded links, with one specifically pointing to a known malicious redirector. The document's content, though heavily obfuscated, appears to be a lure for downloading applications, likely to facilitate further malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=star+wars+heroes+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_5fb96e0e90281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382961/normal_5fda75c09738c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446395/normal_5fcd0ca0b1b4f.pdfIn PDF document text
    • https://nidarefazumeb.weebly.com/uploads/1/3/4/7/134748986/dipezunewubuw_wulipefi_xozemesavujew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f89b8f543441.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/5fc0b633d26ff1194f72bba3/t/5fce832dcbddc25523514640/1607369518883/best_free_photo_to_video_maker_app.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51130ea4a794d565ff698/t/5fc88c50bbb7f45a928d8182/1606978641279/41977477529.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3703b8ef7301f8b20f9e5/t/5fc810086a077600dbb4e3dd/1606946824068/zawunabotujinadiniw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e8cb2bbd74065813b48b/t/5fc758bc2ac13f1ee9b97c4a/1606899901524/44361727481.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e03b1c8c7413143ed9a1/t/5fc9efcfe4017829c16e5e1f/1607069648214/14106489190.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79625cb936d6a06aa469d/t/5fcc98660ab5d62febecfa70/1607243878956/demolition_derby_multiplayer_apk_mod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc543c1a5bc066edfc25575/t/5fcbf400920f47545b7d32d2/1607201793679/ridasitozokebobigetewib.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e335a5bc066edfa5a857/t/5fc1b2f318e72e5fdb17862e/1606529780114/90105874286.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_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 5304 bytes
SHA-256: 7090587aadf84389a13cc8d8d8bae6b2e8d17db59bd1beb8521a08c9b181f828
font_01_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 11172 bytes
SHA-256: f64f92d30958f8c9374849772cd7df0fd10d713e8243b95b9b3d68f6eea62662

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