Malicious PDF — malware analysis report

Static analysis result for SHA-256 5970c2d8a481f483…

MALICIOUS

PDF

76.6 KB Created: 2021-07-13 15:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 75fdfe448f55d4073233a32402592766 SHA-1: cd407f2fc982c2ed673a801dbba99bdcd15dc7b5 SHA-256: 5970c2d8a481f48330c84e43a24ec55ab4f5afadc99ba8d7ccb3d106d14d8674
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image link that redirects to an SEO redirector. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of a redirector URL points towards an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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/~3/9xivtwLAy4k/square?utm_term=diy+reese%27s+peanut+butter+cups PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7b0bf38ed220952ab536e/1625796800291/42800647352.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed43cbf77a3e4a90f26a5e/1626162123702/gubitamesudigulopi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8c1f0351081123f7b8ee4/1625866736506/24clan_injector_config_file.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7b6b228bb5f4f51616184/1625798322729/91148941884.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecd7d62271a75a72cafa29/1626134487191/area_of_a_quadrilateral_with_unequal_sides.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_off0000ca51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA51 16924 bytes
SHA-256: a9c358419b1d6a99d444b2877b07aa14c7034c3eadffcf01f6837ba05118b664
font_01_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 10592 bytes
SHA-256: 1c7f1fb47292c1dd6e309648e75358bae130ca4dfeb4a160dcf0d05b7047bc9c
font_02_sfnt_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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