Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f33343dcc92c0e…

MALICIOUS

PDF

96.0 KB Created: 2021-07-19 01:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ea899fea6e09b7aa2badf44b45de5ebf SHA-1: 92e4b8be265348b54c119cf8f317e40ca2937cb3 SHA-256: 91f33343dcc92c0e3090bde98a102929525c12b2ae40dcc98e4561ff7d8fa6f2
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a heuristic firing indicating it is a phishing lure using an SEO redirector. The ML classifier also flagged it as malicious. While no scripts were extracted, the presence of a redirector URL suggests an attempt to lead the user to a malicious site or download. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9444

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=test+your+memory+quiz+answer PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec92f7e07849485499bc71/1626116855767/92854060342.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f2e38f26c2747482da0c99/1626530703933/79936509027.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8560e4d8ba653d3aa5fa6/1625839118767/7267087808.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f072063f5e7b0f5ec41b67/1626370567003/st_helena_and_constantine.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f1032569d23120257219ed/1626407717727/76051814928.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec7e98c217102653d5b14b/1626111640781/how_to_color_on.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed9448d2d00a35b8cf89ff/1626182728760/meaning_of_gurgling_in_english.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8380ad4a1a22a3e757b7/1626112896723/download_minecraft_java_edition_for_android_for_free.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_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 10692 bytes
SHA-256: f538b72abd47d08b0c56a404f7dfa2fd038b6e36b9c5c4dc3e5f67b8cc0d23ed
font_02_sfnt_off0001473b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473B 17112 bytes
SHA-256: 41e12183f9745412bfb5aa9bdfa38f05496b1df983c1f5033371f70540042ad0

Open this report in the interactive analyzer, or submit your own file for analysis.