Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ff7fbdd192b222…

MALICIOUS

PDF

81.4 KB Created: 2021-07-13 16:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0a8c6baec678c80c191c39114405e549 SHA-1: 389a95a13655ee86e8915009415e97851917616b SHA-256: 97ff7fbdd192b22297b333d52368c8d2811fb8977cf168c7248c9700482c1d23
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a heuristic firing indicating it's a phishing lure, redirecting users to a suspicious URL. The ML classifier and ClamAV detection further support its malicious nature. The primary IOC is the redirector URL, which is likely used to host malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8287

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://pistant.ru/square?utm_term=terraria+how+to+craft+fishing+rod PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e95b70b6736875596961a9/1625906032425/gikekopinoxotuvolarero.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed47cff84adf285bf10088/1626163152063/the_meaning_of_michaela.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e84236a9c4294aacf58fd9/1625834038258/8518156494.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8925d26d281541e6f0ef8/1625854558004/tafotilariwenunorikadojol.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9013e3b7e7c63344edd13/1625882943103/1877158439.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9293db630645a0ef7ad4a/1625893182239/income_taxation_ampongan_2019_answer_key.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_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 19268 bytes
SHA-256: fcaa6d60348c7bbfe9da46bf37634601254789ac9692c9d32ec916dfd119b7ed
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 10756 bytes
SHA-256: 2a0ea9b935a1e6b506c2959ca06b02fbe40e52cf6b3fb279f8a20795402385ad
font_02_sfnt_off00011feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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