Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba828c4ae876f78…

MALICIOUS

PDF

91.6 KB Created: 2021-07-16 15:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5d1ba88c9279b61163cf5c53437eca4e SHA-1: 418e7eebb03c7b5c00744d48c7130d4be99d15a5 SHA-256: 9ba828c4ae876f7810ea47957187f1690f83adf5d1187d11507dec414493a6e8
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high-confidence ML detection and ClamAV signature for phishing and trojan activity. It leverages a redirector URL, disguised as a free download, to lure victims. The presence of embedded URLs and the PDF_SEO_UTM_REDIRECTOR_LINK heuristic strongly suggest a phishing attempt aimed at credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/mHcMeCcfVl0/square?utm_term=latest+movie+download PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8bfb1996685841a9394a/1626115067882/the_most_beautiful_thing_bruno_major_guitar_chords.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee4fc2e7148d06bc72221c/1626230723026/us_history_staar_test_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e89b947c1ac009fac075a8/1625856916792/latex_hline_thick.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e835087be683581ce613c6/1625830664772/xanasigumafanegep.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f129906e3a8560b3d2bd18/1626417553005/fidojezebuwaxozonaguvuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7810d3b4ef55d90f9f6b1/1625784589593/plant_cell_diagram_labeled_black_and_white.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8a7992d98337f05e239cb/1625859993929/x_ray_chest_views.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f1480fb3a282695d346b11/1626425359136/the_term_information_technology_can_be_defined_as.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee624a4d490f672754792b/1626235466365/29199411807.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 1

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_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 10416 bytes
SHA-256: 2f13be60afd17711d099e011a4c1d6580c376cabd44cd121a173a8992985def2
font_02_sfnt_off00013569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13569 17192 bytes
SHA-256: d3b0f65a5ab532801b701b106328ca97d572cd5ca9126b6d7473789a834d21a9

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