Malicious PDF — malware analysis report

Static analysis result for SHA-256 00872d402d844fd5…

MALICIOUS

PDF

74.1 KB Created: 2021-07-13 00:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa8b59dac6221977f9c76caed0c13693 SHA-1: 19c142c97a98efd40036e1d67704560f57d18ceb SHA-256: 00872d402d844fd54093638668e4a1b8730ffed48c572013ad4734554ce8b37a
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, indicating a high likelihood of malicious intent. The presence of embedded URLs, although many are marked as benign, suggests an attempt to direct the user to external resources. The document body is heavily obfuscated, but the overall structure and heuristic firings point towards a phishing or malware distribution vector, likely using a spearphishing attachment as the initial access method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7882

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/sq/ugae/~3/mHcMeCcfVl0/square?utm_term=additional+floor+to+a+house
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec93d37d354a5e86a4508a/1626117076092/irrigation_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e82f8a9ebc0053f319fb1f/1625829258795/drugs_for_labyrinthitis.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e94ce9defa333328abd552/1625902313822/hollow_knight_fifth_pantheon.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e92c9f37cb90447560619d/1625894047525/palibasajitotawi.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_off0000c5ec.bin
4af254abc503bdb43617f70575e025ba2917bdb73abc57077028aa116e0ce318		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EC 10532 bytes
font_01_sfnt_off0000ddd2.bin
986559821da104cfe9e6fba0e38d69743f5736fe509cd6b5d07227768efcca3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 15260 bytes
font_02_sfnt_off000104a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 16792 bytes

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