Malicious PDF — malware analysis report

Static analysis result for SHA-256 960fdd559568fabb…

MALICIOUS

PDF

87.2 KB Created: 2021-07-15 18:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae46b3e3166fc740b61ffc6df312ce22 SHA-1: 6314d82aa668900664c6ae700e0aee94e97199a4 SHA-256: 960fdd559568fabbc506dab99932839f69d0927bddcd5b1c16c2d712aafcff20
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, even if some are confirmed benign, suggests an attempt to redirect the user. The PDF structure itself contains unusual elements like duplicate object bodies, which can be used to obfuscate malicious content. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5959

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/kVSxLQpkboc/square?utm_term=way+of+gray+workout
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e86a86419c280ea9ac43f3/1625844358867/find_the_prime_factor_of_36.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f021c24063550b157df516/1626350018701/14535208399.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec792fb8cbe518df56dc9e/1626110255578/anemia_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecb6a9522a830616591b35/1626125993956/last_year_12th_english_question_paper.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 16792 bytes
font_01_sfnt_off00010ffb.bin
ead8b6a11a5e2e6399940d8833562ae20a3cae3e4468096c90303ed55e7ae7ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 10232 bytes
font_02_sfnt_off00012737.bin
4f45f836737f52db9004ca305811f289cd1fe174cf549f0fbb7b9aea12f53b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 16672 bytes

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