Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d29c4f21d0e3f2b…

MALICIOUS

PDF

78.1 KB Created: 2021-07-13 04:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 32e65c3c260736f55ca30d2d0edde8da SHA-1: 763ddb4369e4ec8a0458e3c25f5a541f173d5ad1 SHA-256: 9d29c4f21d0e3f2b44f323479f041aa5cc0afae023d75e387eacba7da9dd7d0b
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is a phishing lure, using an image to redirect users to a malicious URL. The ClamAV detection and ML classifier further support its malicious nature. The primary IOC is the redirector URL used in the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://infrive.ru/square?utm_term=cbt+exam+questions+and+answers+pdf PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79a314aaab0286a871d91/1625791025390/what_is_the_collective_noun_for_robbers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e78f281d61f435cef37c07/1625788200433/iit_jam_maths_question_papers_with_solutions.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eccd8e688cba50b67410a9/1626131854085/95674259163.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecb5da5f54a92f3bf88858/1626125786685/how_to_defog_back_windshield.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecd2d438b7e93e8f9823e8/1626133204596/38468780790.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8c387b14134336dd4a73/1626115128347/nursing_behavioral_interview_questions_and_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e76f705586cb4fcb43c630/1625780080290/shannon_diversity_index_equation.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecbf5bda1bc628e6081bd8/1626128219141/bobabera.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8cf7840fa0f2168471397/1625870200530/3183667183.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_off0000cde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE9 11220 bytes
SHA-256: 6cd782cdb45d51ef9c76c4bfcb7f44ed510aeb0b16bef7315e0b266ada05cfa0
font_01_sfnt_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 16968 bytes
SHA-256: 81271d817dddf1b8f7ee163584b6be8148bb5c22db4bb930287359167b3f0bd9
font_02_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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