Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3804a8eb8a10686…

MALICIOUS

PDF

74.1 KB Created: 2021-07-12 20:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4467d1f7e6b37b5a293cc5d8bd59eb39 SHA-1: e5aa39d4c60f069a4aa7f941ae5dd7e370af488e SHA-256: d3804a8eb8a1068648dd434c4a70015e6d19e85c51d5833dc52232e553bd0e7f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. A high-severity heuristic identified an image lure linking to an SEO redirector, suggesting a phishing attempt to trick users into downloading further malicious content. No scripts were extracted, but the presence of external URIs and the overall detection profile point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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/um1bUVUAM38/square?utm_term=manual+toyota+camry+1996 PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7b634c0b954f9ea36766/1626110819927/41528919459.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7aa75978cb5ccaa9e171/1626110631682/fezinadizuxam.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7bc46adf2c26882ff0bcd/1625799751183/how_to_find_answers_for_tests.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec77bbf89f8e700bf6460a/1626109883254/how_high_should_golf_tee_be_for_driver.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec79ba12c1416d2f19c7fe/1626110394048/90993196222.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_off0000c2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 15996 bytes
SHA-256: 8ca9929c26172a4952555158d9ac7ad6dfc75d6e124fc922a794c12880ca1848
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 10596 bytes
SHA-256: c58cc8dc0d105caf6f9bc578b60d9fc218e9bf45b396e099b7411930de9b27ca

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