Malicious PDF — malware analysis report

Static analysis result for SHA-256 958f48335c41503e…

MALICIOUS

PDF

110.3 KB Created: 2021-07-16 14:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 43a3af352f55c810b3052dd676e4fb84 SHA-1: 1741507e8c81baa413c6854e5d37c116fc2b7c83 SHA-256: 958f48335c41503e053fa07498edeb994d3af525d322b21861a5aad774a17080
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate an image lure linking to an SEO redirector, suggesting a phishing attempt disguised as a free download. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7738

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/S-4CHg4Qmwo/square?utm_term=what+is+a+progressive+verb PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f07c19a05bd62f13de5a20/1626373145961/limitation_of_crystal_field_theory.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e815fd4261ba798063626d/1625822717647/philips_fr975_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee74ac39b82603386d6d20/1626240172231/earth_in_the_beginning_of_time.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edd90b8e89d93564d45718/1626200331181/60921522068.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed9a037d02012a3631c787/1626184195595/komux.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 2

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_off00014e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16643 10580 bytes
SHA-256: 59c51d3997931a1a5568c55bb7219f6e05383e17ca9ccccd66819ed78c1da292
font_02_sfnt_off00017e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E67 18180 bytes
SHA-256: 26fa47f9702a525192bf2bb34dcc6750884c2f116a974257ff0276d4b081b433

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