Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0675661d38e9a1…

MALICIOUS

PDF

78.7 KB Created: 2021-07-17 19:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b40680a91aa463f7ed00704a2cb598c1 SHA-1: 3cf860b3aa7e5298bca64da48036f16b720bc7da SHA-256: ab0675661d38e9a11159da568923829446f2250a60a6a07ebd2aa7888ecc654b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that, while currently marked as benign, is presented in a way that suggests a phishing lure. The presence of PDF-specific heuristics and embedded artifacts indicates a crafted document, likely intended to trick users into visiting the linked URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8621

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/UZrB20b2Dcg/square?utm_term=how+to+calculate+enthalpy+change+of+combustion
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f1fd843a444c225b46c6f5/1626471812420/tubububo.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7fb459713006cbe10189/1626111924467/nijidulakivow.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed38ad67dd777ebfbef516/1626159277307/eugene_sheffer_crossword_puzzle_answers_for_today.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f016b9a26b2b69a35e4c90/1626347193260/rudupu.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8ffe818245d33f1806161/1625882600226/a_practical_course_in_effective_english_speaking_skills_free_download.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_off0000cf61.bin
34844536c03ff493f680822e2dfec4ff26f1ea1ab4690ba200feb736fd3f382b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 11256 bytes
font_01_sfnt_off0000e969.bin
8c92b176b4d5a354ed31cfd154ee7e9b954d20a40a0cd0302943c70b1f6b5f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 17152 bytes
font_02_sfnt_off0001166c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 16792 bytes

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