Malicious PDF — malware analysis report

Static analysis result for SHA-256 3096acc857cffb29…

MALICIOUS

PDF

75.0 KB Created: 2021-07-12 23:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5b30342b85f26af9bf86a097f083c2fa SHA-1: ea96769ed6a5a6e8799e18d44874f97a383205f8 SHA-256: 3096acc857cffb298e6924b92792e4150567bc52e209273fa78c91c465ccdab4
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded URI that redirects to a URL associated with SEO redirectors, commonly used for phishing lures. No scripts were extracted, but the overall structure suggests an attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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
  • 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/sq/ugae/~3/y83TWYo-3DA/square?utm_term=half+subtractor+using+nand+gates+only PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8a79f3817d36d1155b4ff/1625859999730/44108838404.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7ff0fd54eb0708257cb7/1626111984869/zejikemirovoliwuzazega.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8ed7f37da2614570b98cb/1625877887989/jumimogowuroguniwo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e885c479f63424433fa562/1625851332659/first_day_of_summer_2021.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7d5398592fe3a58916f71/1625806137317/hey_you_i_hate_your_friends_and_they_hate_me_too_lyrics.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DE 10996 bytes
SHA-256: 16d9ee8826b94bc95bf1809760d3cddbbc688f34f93d7032d8828ca50c3b3bf9
font_01_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 15492 bytes
SHA-256: c2db0d546bf3962abdc046f6c81164216c26e22ac1884052448ae4107aaf6d61
font_02_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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