Malicious PDF — malware analysis report

Static analysis result for SHA-256 199a78c31916f30d…

MALICIOUS

PDF

76.3 KB Created: 2021-07-13 18:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 9a424ec72bc2baadf05462ed286631d4 SHA-1: 88302811b0db1fb9319464d3fb8f72d032e3f096 SHA-256: 199a78c31916f30de727d431b109362225be51adfccaca57675cf1ded3622b10
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI that functions as an SEO redirector, likely intended to lure users into clicking a link for malicious purposes. No scripts were extracted, but the presence of a redirector URL strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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/-7-cX3opz_8/square?utm_term=lords+mobile+coupon PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed061e6be96a4ec40578bb/1626146334686/15258714488.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8260cba333063f17b8f88/1625826828736/english_grammar_and_spelling_checker.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8b9bc217102653d70f6e/1626114971827/7th_standard_state_board_maths_textbook.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_off0000cc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 16152 bytes
SHA-256: fe51d0164ce72f3f791de5fd5789bcc2262dde22bef679123720f6a0af234a91
font_01_sfnt_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 10612 bytes
SHA-256: ed28655910fc125ec3ad249e97d05e9db90a81bd40cd95fa741669dbae2d5e0c
font_02_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1