Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8db770ab4a3fb23…

MALICIOUS

PDF

77.0 KB Created: 2021-07-12 21:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bc101441c7b46dff19f43284ed40ce99 SHA-1: 11144118b45b44121f30f2860505af62b11de6f7 SHA-256: e8db770ab4a3fb23c0a2515813f9067dead68135424ddc6ad87c4a7bc4a52f94
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate the presence of an image lure linking to an SEO redirector, suggesting a phishing attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and heuristics point towards a malicious document designed to trick users into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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/razvivatel/yapz/~3/0YvHz_IItD0/square?utm_term=definition+of+fusibility PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8cc44f28789513b645ab3/1625869380459/famous_dental_clinic.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7ac5e64ce5371633e75e/1626110661816/foreshadowing_in_english_literature.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e87d2533c3d3411a98eb87/1625849125482/youth_bmi_chart.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e90c34b10b9b33fa97025f/1625885748740/notexokudopetu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e86fc6e0b7df382a7f2ec9/1625845702996/zafesedutedemepelemufezuv.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 7

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_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 16912 bytes
SHA-256: cce9c820801d96e73b79ef7f3527829a793c269130d196d1c3ae161e176b0a2e
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 10300 bytes
SHA-256: d29defcc2ca9ebf0366262123cfb20b5968116df8e28ada55f3ad14478d8e84a
font_02_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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