Malicious PDF — malware analysis report

Static analysis result for SHA-256 644d87916d897b65…

MALICIOUS

PDF

71.1 KB Created: 2020-12-04 22:24:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 18e0cbcb11c9722a49b0939e8b2c4a5a SHA-1: b9fe416cabac11eb16611c5000b2fcb5dd65da4a SHA-256: 644d87916d897b65e6b81b1b7ff69a497a7e96b1fd21294d48ff651c708c76a6
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by heuristics as a redirector for phishing. The ML classifier and ClamAV also flagged this PDF as malicious, specifically indicating a phishing or trojan-like behavior. The document body, though heavily obfuscated, appears to be a lure related to a hospital report, consistent with phishing tactics.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffking.ru/aws?utm_term=yeovil+district+hospital+cqc+report In PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/6879692.pdfIn PDF document text
    • https://gazofifato.weebly.com/uploads/1/3/4/4/134496451/doxilofuwe-vepatitar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401519/normal_5fc4455b9a103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_5f9b5d7256ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fb678d10c895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fbfc49f766d0.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/5fbfdb415687f52b6b7b2913/t/5fc35f411972c46e3c09324e/1606639426807/jbl_flip_4_bluetooth_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/57620285646.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd206b771f5d42aa238862/1606230124164/convert_255mm_to_inches.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56b7140f1034a5cc72ee0/t/5fc8fc476c6c0711539b19b9/1607007304155/how_to_write_business_plan_sample.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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 5308 bytes
SHA-256: 7fd964b85a15f2763e06e77062555138fe5aaf866a637e6f49186a0735178af0
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10216 bytes
SHA-256: ac137a02d6945096e229f8569c74f3a61b6742b633314aecb310af0c4ed6297a

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