Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a52f0d6e3b2e5f5…

MALICIOUS

PDF

73.0 KB Created: 2020-11-18 02:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 962e095e7e3fd289c14f4c295544f490 SHA-1: 014a9d50266b601986f1b1c07770efed973b40cc SHA-256: 3a52f0d6e3b2e5f502ad92e1be2f3bdd411a70f7b2f0a26a6db750b86e2d063a
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm. The presence of a 'download button' lure suggests a phishing or social engineering attempt. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ggtraff.ru/123?utm_term=sea+doo+owner+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f883845286c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5f9b388daac9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5fabbc3f9d0ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388282/normal_5f8ed88b4dfea.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/5322233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5fa384bddccbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5f8a5eadad035.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fd38ae81-ac6f-4aa9-96f7-9f5faf039019/90720195971.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/the_visible_ops_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/senadamapewilavuromenozox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 4740 bytes
SHA-256: b3ffd7597d6a18d5504578ebcc03707afe387bb7e1327d3b357a24eed6f96a96
font_01_sfnt_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 10772 bytes
SHA-256: 4eba27e496d58dda08281eaa800a62521b0f4121423b319545d40596e47b0f63
font_02_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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