Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bf7b99ed3e3964…

MALICIOUS

PDF

75.4 KB Created: 2021-07-14 07:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4164259394e9f340321e70a6f447b6ab SHA-1: a3288bbc71098af738ab4a6659a3d0fb5530b464 SHA-256: 78bf7b99ed3e396465ed4ab3d8116e527d42701ba3d3c0995e26157dcdb89881
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to an external URL. The ML classifier and ClamAV detection further support its malicious nature. The embedded URL, https://krisoc.ru/square?utm_term=determine+the+force+that+the+smooth+roller+c+exerts+on+member+ab, is the primary indicator of compromise, likely leading to a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8802

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://krisoc.ru/square?utm_term=determine+the+force+that+the+smooth+roller+c+exerts+on+member+ab PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edc35acc8e436e4662b3df/1626194778644/quotes_on_morning_sky.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecac965338e9546e4b1306/1626123414303/west_point_missionary_baptist_church.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edc56c8f209f4d82816a04/1626195308621/25635176775.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e86624cb142a1539d7460e/1625843236247/johnny_hoe_cakes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee378c4d490f6727517a32/1626224524814/rexiruvetudiwiziz.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_off0000c678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 16068 bytes
SHA-256: d1b399d2b21452616baff6320dcc146b8dd5f8a30a4cbddef1da8204e9b6b08d
font_02_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 10844 bytes
SHA-256: 2ab3ba8ec23c4ecef17e2f1d3710e2203f5c273b81758323bb3b2840886c4409

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