Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95d81c004a0d8c6…

MALICIOUS

PDF

73.8 KB Created: 2021-07-12 21:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cf64eb6c0f338d6fdf04646c202b23d6 SHA-1: 4ed010a943ed28250fac2e29f645c1e161e3ae67 SHA-256: a95d81c004a0d8c6154e2da81620ec45797ef8f5116c1a69545368b850e991eb
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a phishing lure, using an image link to redirect users to a potential phishing site. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were extracted, the presence of a redirector URL suggests an attempt to lead the user to a malicious site for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8802

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
  • 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.
  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/iXsW93xxTQA/square?utm_term=technical+writing+style+guide PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7714a3e9df788e6c1702/1626109716833/p0344_ford_f150.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec881b54a52c186ce58b08/1626114075444/mumapoga.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7af4f25441e1b3783b184/1625796431210/convert_encrypted_daisy_to.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e80e7ae8ef4d41b4fcc85f/1625820794753/gajuloloxubopisipanuvopa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec849ccc9768212242d76e/1626113180212/all_music_periods.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 10792 bytes
SHA-256: 21fc4bf363fb00f649180737c557d476762187560359477c844807571acf6dd9
font_02_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 15464 bytes
SHA-256: 32583f4a7c6691477b0e3a012263fffdb2d6da6e0376f6bf8d931fb52cc384d2

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